Overview
This is the last week of Tealeaf course two. Most of the materials this week is about taking thePostit project we built in week 3 and add some finishing touch to it. The topics include some intermediate level techniques such as slugs, Admin role, and time zone. It took me an extra two weeks to finish due to a nasty flu that kept me in bed for a week, plus a trip to Hong Kong that kept me away from my computer for a few days.
My final Postit app is up and running at: My Postit
My source code for this project is at: Postit on Github
The last assignment of the course is about creating my own rails application in 3 to 4 days, the process was both fun and struggling, luckily, I completed all the functions I want in time.
My final project is up and running at:
I’ll make a blogpost about the my struggle during implemenation and the technical highlights of this app later.
Ajax and Rails
A quick review about Ajax: Ajax is short for Asynchronous JavaScript + XML. From the programmer’s point of view, Ajax allows programmers update part of the webpage’s content/data without having to refresh the entire page. Which is great for enhancing user experience and reducing computational cost. This week’s materal is about rails-flavored Ajax, which is about making Ajax request in by using rails helper instead of jquery and other methods.
First, we add remote: true
to the linker helper method :
1 <%= link_to vote_post_comment_path(comment.post, comment, vote: true), method: 'post', remote: true do %>
The remote: true
will add data-remote="true"
into the html tag. Now when I click on the link generated, rails will send the following request:
shell
Started POST "/posts/9th-post/vote?vote=true" for <IP_ADDRESS> at 2015-03-05 11:17:59 +0800
Processing by PostsController#vote as JS
Notice the Processing by PostsController#vote as JS
, which means that this is a javascript request, and we need to handle this javascript request in the respective action of our controller. To handle different formats of response, we can add:
1 respond_to do |format|
2 format.html do
3 if @vote.valid?
4 flash[:notice] = 'Your vote was counted.'
5 else
6 flash[:error] = 'You can only vote on a post once.'
7 end
8 redirect_to :back
9 end
10 format.js
11 end
Notice that if we leave format.js blank as it is shown in the above code, by default rails will render a template with the same name as the action, so in our case it will render a template callled vote
in our post controller, but it’s not an html template, it’s a javascript template, so we need to create a new file named: vote.js.erb
under views/posts/
erb vote.js.erb
1 <% if @vote.valid? %>
2 $("#post_<%= @post.slug %>_votes").html("<%= @post.total_votes %> votes")
3 <% else %>
4 alert('You can only vote on a post once.');
5 <% end %>
The javascript code shown above is pretty straightforward, it’s about replacing what’s inside the html tag that has id
equals to post_<%= @post.slug %>_votes
with html code:
erb
<%= @post.total_votes %> votes
Slugs
Slug, or semantic url, is a technique to transform url from pure numbers into more descriptive, readable words. Which not only make an web application more user friendly, it also helps improve the application’s SEO (search engine optimization) and protects the url from leaking informations related to the application or database. For example, postit/users/8
will give away the that there are aorund 8 users registered for this particular web application.
So we want to change postit/users/8
into postit/users/eugene-chang
in our url when we’re displaying the user profile. We can start by
Extract Common Logic to Module
Sometimes we have repeated logic and code across different models, for example, our slug function. Having repeated code across different models doesn’t just made the code more complex, it also become more difficult to maintain later on. So it’s best that we extract the common logic/code into a module, and just include the module for the model class that we need to use it, and it’s implementation is quite simple in rails:
We want to put our extracted common logic under the folder app/lib
, so we need to configure the path for rails to look for in application.rb
file:
ruby /config/application.rb
1 config.autoload_paths += %W(#{config.root}/lib) #**find the file underneath root/lib
Now we can move all the logic related to slug into the module file under lo
ruby /lib/sluggable.rb
1 module Sluggable
2 extend ActiveSupport::Concern
3
4 included do #the code will be executed when this module is included
5 before_save :generate_slug!
6 class_attribute :slug_column
7 end
8
9 def to_param
10 self.slug
11 end
12
13 def generate_slug!
14 #self.slug = self.title.gsub(" ", "-").downcase
15 the_slug = to_slug(self.send(self.class.slug_column.to_sym)) #change slug_column into symbol and pass it to to_slug method
16 obj = self.class.find_by slug: the_slug
17 count = 2
18 while obj && obj != self #while post object exists, and it's not the same object we're dealing with, need to append a number to it
19 the_slug = append_suffix(the_slug, count) #two posts with same title will create same slug, not good!
20 obj = self.class.find_by slug: the_slug
21 count += 1
22 end
23
24 self.slug = the_slug.downcase
25
26 end
27
28 def append_suffix(str, count)
29 if str.split('-').last.to_i != 0
30 return str.split('-').slice(0...-1).join('-') + "-" + count.to_s
31 else
32 return str + "-" + count.to_s
33 end
34 end
35
36 def to_slug(name)
37 str = name.strip
38 str.gsub! /\s*[^A-Za-z0-9]\s*/, '-'
39 str.gsub! /-+/, "-"
40 str.downcase
41 end
42
43 module ClassMethods
44 def sluggable_column(col_name)
45 self.slug_column = col_name
46 end
47 end
48
49 end
Once I finished adding the module file, I can simply use the module by including it in the model:
1 class Post < ActiveRecord::Base
2
3 include Sluggable
4
5 end
Admin Role
You definitely do not want all the users to be able to perform destructable actions. So it is better to set up a administration class users, and only grant these users the ability to perform destructable actions. This can be implemented by adding an ‘admin’ column to Users table, and add the following method to application controller:
1 def require_admin
2 access_denied unless logged_in? and current_user.admin?
3 end
Conclusion
After much delay (about 15 days) I am finally done with the material of this week. The week 4 material is focused on some techniques to make a rails app more sophisticated, such as slug, admin role, and time zone. The final project took me a few days to work on it. Although I ran into a few hurdles, the overall process is very fun. There is no better way to feel accomplished as a programmer other than being able to bring your concept and idea to life with the skills you master.


What is Version Control?
What is git and GitHub?
10-25-2015
Version Control is a system or software that allows you to keep track of all your files and save different "versions" of them with the changes you've made. So if at any point you were dissatisfied with any changes or just wanted to review them, you can go back to previous versions. While version control is very helpful to keep track of your own files, it can be of more use with collaborators and team members.
Git, which is a version control system (VCS) allows team members to interact by working on any same file(s) at the same time without overwriting anothers changes. Git is designed to help track files by using a "tree" type of system, where there will be a master branch that a team can work on by adding changes or features. They can do this by creating branches of their own from the master and add changes to test out. Once fully tested, they can be merged back into the master branch. Git also uses something called a "commit", which is used after you've made changes or finished a task. Commits are a snapshot of your code, which is like an official saving point that also provides a "commit message", describing the changes. GitHub is a great remote repository to store all of your files/code.
GitHub is like a social media website for developers. Not only are all programmers on there but you can see what they're working on, network with likeminded individuals, and make suggestions/changes. GitHub.com provides online repositories that you can create, which is where developers can store their projects. Additionally, GitHub is "open source", which means all of their code is easily inspected and freely distributed.


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My Education
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GRAPHIC DESIN DIPLOMA
Reverse College / June 2016 - May2018
4.0GPA
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IT DIPLOMA
Lethbridge Collage / June 2018 - May2020
4.0GPA
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Work Experince
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LEAD WEB DESIGNER
ABC Company.Saskaton / June 2012 - May2014
3Years
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JUNIOR DESIGNER
XYZ Company.lethbridge / June 2010 - May2012
1Years
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WEB DEVLOPER
The Company. Lethbridge / June 2008 - May2009
1Years
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The REAL meta
It seems to me that people who like tank games also like tank game statistics. You wouldn’t be so wrong to think that the actual meta of AW is the thoughtful, civilized and above all respectful discussion of tank statistics and their impact on the w,a,s,d and click.
Anyway, I like tank statistics, so into this meta I’m going to inject a series of unofficial and statistically suspect posts analysing game data covering a big chunk of the balance-not-2.0 period.
Why unofficial? Because I am in no way affiliated with the people who run AW. In fact, so much so that I’m not even sure if I can use that totally randomly selected banner image as the face of this project.
If it doesn’t show on your machine, I believe it’s a Challenger 1 (on your team), sniping sideways without applique after yolo-pushing through the center of Ghost Field under intense fire in the first 20 seconds of the match. I can only assume this later left the driver lots of time to berate you in chat for a lack of support.
Why statistically suspect? Because I’m using data that, while almost certainly useful and interesting, cannot be said to be an unbiased view of AW from a scientific or statistical perspective. Plus also this isn’t my job so I coulda made calculation mistakes.
The data
A very comprehensive set of match data is written to ../peristentdata/garagedata1.xml, wherever your AW install might be found.
This appears to be a client cache of your match results, containing much of what is in the game report at the end of a match (plus some interesting extras). You can check it out for yourself.
The file is occasionally overwritten/reduced in size so you won’t find your entire history, unfortunately. Match results are written to the file when you close AW, and if the client crashes the matches appear to be lost. This has only happened a few times to me.
I’ve been saving my garagedata1.xml files since about March of this year. The contents of these files is what I’ll use to do the analysis. Here are some stats on the sample:
Period: 2 Feb 2016 - 04 Oct 2016
Total matches: 3554
PVP (NA): 2671
PVP (EU): 468
PVE: The rest
I’ll focus on PVP and then perhaps cover some PVE later on.
Statistical methods
This set of matches was obtained using the following sampling method: The set of games - out of all played in AW’s public beta - that I was in.
Statistically speaking, this biases the results. However, statistical bias doesn’t mean the results aren’t usefully accurate or representative of most players’ experience. I’ll try to point out where I think an underlying bias is affecting results.
One thing that mitigates the bias is that this is a game. Unlike the real world, a game is designed to provide a fairly consistent experience. It would be… interesting from a game-design perspective if after ~3000 pvp games I had experienced a radically different game from other players.
We’ll just use our judgement in thinking about the results.
Don’t get up in OE or MyCom’s front plate
Finally, whatever the results, I’d recommend not giving the OE or MyCom people too much trouble (except about the Challenger. Seriously guys come on). I’m using this data because it’s the best I’ve got. However, it IS a biased sample and it’s mostly focused on NA, which is a weird family.
Generally, people spend a lot of time in statistical analysis compensating for data problems/sample bias. Often, the very best way to solve these problems is to get better data. That’s not usually practical. HOWEVER. In this case, OE has the data for every match played. If I had access to that data, I would
- Use a census (everything) where practical and
- Take a different approach to a lot of things.
So, again, we’ll apply judgement to the results and remember that OE might see significant differences in their data.
Ask questions if you have them, you can find me on reddit.


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Rating: {{show.Rating}}
You have no tracked shows! Go to shows to select your favorite show.


(it was awarded 2nd place in this year's UI5 Top 5)
HTML: intermingled structure and data.
CSS: defines how the HTML should look like.
JavaScript: user interaction, communication with the backend, dynamic UI building, etc.
UI5 is a (archaic) partially open source framework from SAP. It has all the necessary parts for building UIs from scratch.
UI5 applications boil down to a tree of controls. Each control may have several aggregations under which child controls may reside.
Each control has a renderer function or class which is responsible for writing the control's HTML.
JSX is a syntax extension for JavaScript popularized by ReactJS.
The power of JSX is that it can be mixed with regular JavaScript expressions.
For example the following JSX expression:
{
["A", "B", "C", "D", "E"].forEach(l => - { l }
)
}
... could potentially create a list with 5 items.
JSX needs to be compiled into regular JavaScript.
For example the following React JSX expression:
const element = (

Hello, world!

);
... gets compiled using Babel into:
const element = React.createElement(
'h1', {className: 'greeting'}, 'Hello, world!'
);
UI5 allows developers to define their own controls, in the same way that standard controls are created by SAP.
Rendering the HTML for a control is a pain in the #$!. It is highly error prone and completely unreadable.
UI5 documentation renderer example:
function(oRm, oControl) {
oRm.write('
');
oRm.writeEscaped(oControl.getText());
oRm.write('
');
}
Wouldn't it be easier to just write:
function(oRm, oControl) {
var size = oControl.getSize();
oRm.render(

{ oControl.getText() }

);
}
We can do just that using Babel with a small plugin that I wrote.
There is a wide support from tools and frameworks:
Can be checked at design time using eslint to prevent frequent mistakes (e.g. forgetting to close a div tag).
Arguably, it has the most flexibility because it can use JavaScript expressions directly.


| Front Page / Tutorial: Metafunctions and Higher-Order Metaprogramming / Lambda Details / Placeholders |
The definition of "placeholder" may surprise you:
Definition
A placeholder is a metafunction class of the form mpl::arg<X>.
The convenient names _1, _2,... _5 are actually typedefs for specializations of mpl::arg that simply select the Nth argument for any N. [6] The implementation of placeholders looks something like this:
| [6] | MPL provides five placeholders by default. See the Configuration Macros section of the MPL reference manual for a description of how to change the number of placeholders provided. |
namespace boost { namespace mpl { namespace placeholders { template <int N> struct arg; // forward declarations struct void_; template <> struct arg<1> { template < class A1, class A2 = void_, ... class Am = void_> struct apply { typedef A1 type; // return the first argument }; }; typedef arg<1> _1; template <> struct arg<2> { template < class A1, class A2, class A3 = void_, ...class Am = void_ > struct apply { typedef A2 type; // return the second argument }; }; typedef arg<2> _2; more specializations and typedefs... }}}
Remember that invoking a metafunction class is the same as invoking its nested apply metafunction. When a placeholder in a lambda expression is evaluated, it is invoked on the expression's actual arguments, returning just one of them. The results are then substituted back into the lambda expression and the evaluation process continues.
There's one special placeholder, known as the unnamed placeholder, that we haven't yet defined:
namespace boost { namespace mpl { namespace placeholders { typedef arg<-1> _; // the unnamed placeholder }}}
The details of its implementation aren't important; all you really need to know about the unnamed placeholder is that it gets special treatment. When a lambda expression is being transformed into a metafunction class by mpl::lambda,
the nth appearance of the unnamed placeholder in a given template specialization is replaced with _n.
So, for example, every row of Table 1.1 below contains two equivalent lambda expressions.
mpl::plus<_,_> |
mpl::plus<_1,_2> |
boost::is_same< _ , boost::add_pointer<_> > |
boost::is_same< _1 , boost::add_pointer<_1> > |
mpl::multiplies< mpl::plus<_,_> , mpl::minus<_,_> > |
mpl::multiplies< mpl::plus<_1,_2> , mpl::minus<_1,_2> > |
Especially when used in simple lambda expressions, the unnamed placeholder often eliminates just enough syntactic "noise" to significantly improve readability.


Always curious as the image aside suggest,patients and persistance are my things,love Dancing, Swimming and travelling.
Above all "something funny with me" i like laughing alot at some point someone might think i'm mad!
Educational background;
Educational;Studied at Naivasha boys boarding primary school,
later went to Ngumo high school,later i joined mku for packages.
Afterwords joined Wasreb company NHIF building for field work, now schooling.
Hobbies tend to change with time, due to changes in some conditions meanwhile;
john mwangi first webpage!
=======Always curious as the image aside suggest,patients and persistance are my things,love Dancing, Swimming and travelling.
Above all "something funny with me" i like laughing alot at some point someone might think i'm mad!
Educational background;
Educational;Studied at Naivasha boys boarding primary school,
later went to Ngumo high school,later i joined mku for packages.
Afterwords joined Wasreb company NHIF building for field work, now schooling.
kjiuiyhgt
Hobbies tend to change with time, due to changes in some conditions meanwhile;
john mwangi first webpage!
>>>>>>> master


Spring has many modules to make cut short project development lifecycle. One of the most commonalty used module is Spring MVC.
There have many different versions of Spring MVC. We are going to discuss about the most recent ones.
What is MVC.
MVS stands for model, view and controller. It is a design pattern mainly for web based projects.
Model stands for data (java data objects/ beans)
View is display to the user (It usage model to show dynamic data)
Controller takes request and update data/model and redirects to view.
Spring MVC entry points is a Dispatcher servlet which can be configured in web.xml. Dispatcher Servlet is responsible for all request mapping to controller and resolving the view. Controller and it’s method are mapped to specific URLs these mapping are maintained in dispatcher servlet. Spring automatically does it by scanning @controller classes and @RequestMapping annotations. Later it finds out the view name and resolved the JSP or equivalent markup language to render the data.
Configuring Disaptcher serverl in Web.xml
This is not required when you are using spring boot with embeded web server.
Add following to pom.xml
XML Based Basic Configuration
Configure component scan package and view resolver.
Spring Boot Web MVC configuration.
Add following in pom.xml
Spring Boot view resolver.
Create Controller and create get resource.
Run Spring Boot.
Spring MVC annotations.
Here we will see the Spring annotations briefly.
@Controller Or @RestController
@RequestMapping
@PathVariable
@RequestParam
@ModelAttribute
@RequestBody and @ResponseBody
@RequestHeader
@Controller Or @RestController
Controller provide a URL to method mapping, Controller classes will be singleton and will automatically gets registered in Spring Dispatcher. RestController is specials type of controller to serialize and transform(JSON,XML etc) the response object directly. If not you would have to use @ResponseBody to transform the objects.
RequestMapping, Request mapping is used define the URL path for that method or controller class.
@RequestBody, In case you want deserialize the request object to some class you can use @RequestBody. It transform JSON,XML to java object.
@RequestHeader, In case you want capture request headers in some variable.
Model, ModelMap, ModelAndView, ModelAttribute
Model is an interface and ModelMap is implementation of that class you can use them interchangeably.
ModelAttribute, You can write a method which return some value and that value you want to store in model object.


140; 12023 H.E.
I wanted to write a small post of appreciation for this great show, Golden Boy. A man completes all required university course credits for a Law degree; instead of graduating as anyone in the ordinary sense would—Kintaro travels across Japan, working odd jobs—all to pursue knowledge and learn everything a book won’t tell you. A student of life.
There is so much I would like to say; however, due to the short nature of this OVA (only 6 ~20min episodes) and its contained story—I’ll be succinct. Golden Boy is inspirational in showing you there is probably much more to life than we think there is.
Of course, you are “cool” and “jaded”. Surprise. Aren’t we all? Cynicism and a feeling of “I’ve seen life” follows us all, and the fact you succumbed to it shows nothing noble of your character. Do not deny those negative feelings either. They don’t want to be with you as much as you don’t want to be with them. Fear, jadedness, and apathy are all-natural, but it is our responsibility and duty to not let those lowly sensations dictate our life or drain us of energy. Accept them as if you are telling them, “You can tag along, but I have other things to do today.”
Golden Boy capitalizes on that big time with Kintaro. The protagonist isn’t a freezer because he isn’t “smart” or “ambitious’' enough to get educated, trained, or employed somewhere. He cleared all Law degree requirements (with his integrity), and the stories he’s in prove otherwise. Kintaro is an incredibly resourceful and intelligent individual.
Exploring the different walks of life, getting to know people with all sorts of diverse backgrounds, and, if ever so shortly, becoming a part of their lives—every time almost as if by some miraculous accident, helping them to overcome challenges they’re faced with. While at that, Kintaro faces challenges with skills and life lessons he picked up in his ventures. Be it working in a women-only software company, udon shop, swimming pool, and more.
(I should mention, we all can and should do this)
The ambiance of the OVA stuck with me because it touched something I have been consciously worried about—I don’t get to see people as often as I wish. Maybe I’m over-brewing in some parts. At least in my area, I wish there were more of a diversity of people to learn about and interact with. Of course, the show has more of an idealized presentation of being a “free spirit,” especially when compared to modern tendencies of loneliness, social media dividing rather than uniting, and much more.
Day-dreaming about getting out there, pushing yourself into new opportunities to learn, fail, and succeed while also experiencing life from all kinds of unique perspectives is far from new. At the very least, it would be good to remind ourselves how to hold onto that sensation and pure emotion such that our thoughts created by them stay authentic and genuine to who we are. Go, watch Golden Boy (apparently free on Internet Archive) and see if there is something in it for you.
Oh, and btw, the show is very suggestive. ◼


Dear TITLE LASTNAME
The Information Acquisition department has reviewed the reports you have tagged for further enquiry and taken appropriate actions to investigate.
Several new pieces of information have been retrieved and are available for your perusal.
If you need further assistance, we will contact you.
Vitaly Vedenin
Information Acquisition


This section lists the schemas involved with the creation of the final results, and specific tables involved. Refer to schemas section for more schema details.
All source csv files are from the seismic risk model repo in various output repos.
National indicators are results from the various results_psra_{P/T} schema, including psra_{P/T}_indicators_b, psra_{P/T}_indicators_s, psra_{P/T}_indicators_csd, psra_{P/T}_expected_loss_fsa, psra_{P/T}agg_loss_fsa, and psra{P/T}_src_loss tables that are merged together into a one national table for each of the tables above. After merging, earthquake risk index calculations are made for indicators_s, and indicators_csd tables and updated. The EQRI values are then updated in the corresponding results_psra_{P/T} as well.
psra_6a.eqri_calculation_sa.sql
Create seismic risk index (eqri) calculations used for settled area.
psra_6a1.eqri_calculation_csd.sql
Create seismic risk index (eqri) calculations used for csd.
psra_6a2.eqri_calculation_hexgrid_1km_3857.sql
Create seismic risk index (eqri) calculations used for 1km hexgrid (EPSG 3857).
psra_6a2.eqri_calculation_hexgrid_1km_uc_3857.sql
Create seismic risk index (eqri) calculations used for 1km hexgrid (EPSG 4326).
psra_6a2.eqri_calculation_hexgrid_1km_uc.sql
Create seismic risk index (eqri) calculations used for 1km unclipped hexgrid (EPSG 3857).
psra_6a2.eqri_calculation_hexgrid_1km.sql
Create seismic risk index (eqri) calculations used for 1km unclipped hexgrid (EPSG 4326).
psra_6a2.eqri_calculation_hexgrid_5km_3857.sql
Create seismic risk index (eqri) calculations used for 5km hexgrid (EPSG 3857).
psra_6a2.eqri_calculation_hexgrid_5km_uc_3857.sql
Create seismic risk index (eqri) calculations used for 5km hexgrid (EPSG 4326).
psra_6a2.eqri_calculation_hexgrid_5km_uc.sql
Create seismic risk index (eqri) calculations used for 5km unclipped hexgrid (EPSG 3857).
psra_6a2.eqri_calculation_hexgrid_5km.sql
Create seismic risk index (eqri) calculations used for 5km unclipped hexgrid (EPSG 4326).
psra_6a2.eqri_calculation_hexgrid_10km_3857.sql
Create seismic risk index (eqri) calculations used for 10km hexgrid (EPSG 3857).


React helps us build complex, interactive UIs more easily than ever before. It also encourages us to write code in a certain way, guiding us to create apps that are simpler to navigate and understand.
React itself is a mental model with a simple idea at its core: encapsulate portions of your app that rely on similar logic and UI and React will make sure that portion is always up kept up to date.
Whether you've been working with React for years or are just starting, having a clear mental model is the best way to feel confident working with it. So for me to transfer my mental models to you I'll start from first-principles and build on top of them.
Let's start by modeling the basic building blocks of JavaScript and React: functions.
This is hidden away by JSX, the markup language React uses.  JSX is in itself an applied mental model that makes using React simpler and more intuitive.
Let's look at each part individually.
React is used with JSX—JavaScript XML—a way to write what seems as HTML with all of JavaScript's power. JSX offers a great applied mental model for using nested functions in a way that feels intuitive.
Let's ignore class components and focus on the far more common functional components. A functional component is a function that behaves exactly like any other JavaScript function. React components always return JSX which is then executed and turned into HTML.
This is what simple JSX looks like:
Li = props =>
{props.children}
;
export RickRoll = () => (

Never give you up

);
Which compiled into pure JavaScript by Babel:
Li = props => React.createElement('li', props, props.children);
export RickRoll = () =>
React.createElement(
'div',
null,
React.createElement(
'div',
{
className: 'wrapper',
},
React.createElement(
'ul',
null,
React.createElement(
Li,
{
color: 'red',
},
'Never give you up',
),
),
),
);
Now, notice how each component is a function calling another function, and each new component is the third
argument for the React.createElement
function. Whenever you write a
component, it's useful to
keep in mind that it's a normal JavaScript function.
An important feature of React is that a component can have many children but only one parent. I found this a
confusing until I realized it's the same logic HTML has, where each element must be inside other elements,
and can have many children. You can notice this in the code above, where there's only one parent
div
containing all the children.
When using a function we can use arguments to share information with that function. For React components we
call these arguments props
(funny story, I didn't realize props is
short for
properties for a long time).
Under the hood, props behave exactly like function arguments, the differences are that we interact
with them through the nicer interface of JSX, and that React gives extra functionality to props such as
children
.
Using this knowledge let's craft a mental model to intuitively understand functions!
When I think about a function I imagine it as a box, and that box will do something whenever it's called. It could return a value or not:
sum(a, b) {
return a + b;
}
console.log(sum(10, 20));
logSum(a, b) {
console.log(a + b);
}
Since a component is a fancy function, that makes a component a box as well, with props
as the
ingredients the box needs to create the output.
When a component is executed it will run whatever logic it has, if any, and evaluate its JSX. Any tags will become HTML and any component will be executed, and the process is repeated until reaching the last component in the chain of children.
Since a component can have many children but only one parent I imagine multiple components as a set of boxes, one inside another. Each box must be contained within a bigger box and can have many smaller boxes inside.
But the mental model of a box representing a component is not complete without understanding how it can interact with other boxes.
Closures are a core concept in JavaScript. They enable complex functionality in the language, they're super important to understand to have a good mental model around React.
They're also one of the features newcomers struggle with the most, so instead of explaining the technicalities I'll demonstrate the mental model I have around closures.
The basic description of a closure is that it's a function. I imagine it as a box that keeps what's inside of it from spilling out, while allowing the things outside of it from entering, like a semi-permeable box. But spilling out where?
While the closure itself is a box, any closure will be inside bigger boxes, with the outermost box being the Window object.
The window object encapsulates everything else
A closure is a feature of JavaScript functions. If you're using a function, you're using a closure.
As I've mentioned, a function is a box and that makes a closure a box too. Considering that each function can contain many others inside of it, then the closure is the ability of a function to use the information outside of it, while keeping the information it has inside from "spilling out", or being used by the outer function.
Speaking in terms of my mental model: I imagine the functions as boxes within boxes, and each smaller box can see the information of the outer box, or parent, but the big box cannot see the smaller one's information. That's as simple and accurate an explanation of closures as I can make.
"Each function can only access its own
Each function can only access its own information and the parent's
Closures are important because they can be exploited to create some powerful mechanics and React takes full advantage of this.
Each React component is also a closure. Within components, you can only pass props down from parent to child and the parent cannot see what's inside the child, this is an intended feature to make our app's data flow simpler to trace. To find where data comes from, we usually need to go up the tree to find which parent is sending it down.
A great example of closures in React is updating a parent's state through a child component. You've probably done this without realizing you were messing around with closures.
To start, we know the parent can't access the child's information directly, but the child can access
the parent's. So we send down that info from parent to child through props
. In this case, the
information takes the shape of a function that updates the parent's state.
Parent = () => {
[count, setCount] = useState(0);
return (

The count is {count}

<ChildButtons onClick={setCount} count={count} />

);
};
ChildButtons = props => (

<button onClick={() => props.onClick(props.count + 1)}>
Increase count
</button>
<button onClick={() => props.onClick(props.count - 1)}>
Decrease count
</button>

);
When an onClick
happens in a button
, that will execute the function received from
props props.onClick
, and update the value using props.count
.
The insight here lies in the way we're updating a parent's state through a child, in this case, the
props.onClick
function. The reason this works is that the function was
declared within the
Parent
component's scope, within its closure, so it will have
access to the parent's
information. Once that function is called in a child, it still lives in the same closure.
This can be hard to grasp, so the way I imagine it is as a "tunnel" between closures. Each has its own scope, but we can create a one-way communication tunnel that connects both.
Once we understand how closures affect our components, we can take the next big step: React state.
React's philosophy is simple: it handles when and how to render elements, and developers control what to render. State is our tool to decide that what.
When state changes, its component renders and therefore re-executes all the code within. We do this to show new, updated information to the user.
In my mental model state is like a special property inside the box. It's independent of everything else that happens within it. It will get a default value on the first render and always be up to date with the latest value.
Each variable and function is created on every render, which means their values are also brand new. Even if a
variable's value never changes, it is recalculated and reassigned every time. That's not the case with
state, it only changes when there's a request for it to change via a set
state
event.
State is a special, independent part of the box; with props coming from outside
State follows a simple rule: Whenever it changes it will re-rendered the component and its children. Props follow the same logic, if a prop changes, the component will re-render, however, we can control state by modifying it, props are more static and usually change as a reaction to a state change.
The Rendering Mental Model: understanding React's magic
I consider rendering to be React's most confusing part because a lot of things happen during rendering that sometimes isn't obvious by looking at the code. That's why having a clear mental model helps.
The way I imagine rendering with my imaginary boxes is two-fold: the first render brings the box into existence, that's when the state is initialized. The second part is when it re-renders, that's the box being recycled, most of it is brand new but some important elements of it remain namely state.
On every render, everything inside a component is created, including variables and functions, that's why we can have variables storing a calculation's results, since they will be recalculated on every render. It's also why functions are not reliable as values, due to their reference (the function's value, per se) being different every render.
Thumbnail = props => (

{props.withIcon && <AmazingIcon />}

);
The above will give a different result depending on the props the component receives. The reason React must re-render on every prop change is that it wants to keep the user up to date with the latest information.
However, the state doesn't change on re-renders, its value is maintained. That's why the box is "recycled" instead of created brand new every time. Internally, React is keeping track of each box and making sure its state is always consistent. That's how React knows when to update a component.
"When props (or state) changes, a new render happens and the component's output can change")]
When props (or state) changes, a new render happens and the component's output can change
By imagining a box being recycled I can understand what's going on inside of it. For simple components, it's easy to grasp, but the more complex a component becomes, the more props it receives, the more state it maintains, the more useful a clear mental model becomes.
Now that I've explained all the different parts of the puzzle separately, let's put it all together. Here's the complete mental model I use for React components, directly translated from how I imagine them into words.
I imagine a React component as a box that contains all of its information within its walls, including its children, which are more boxes.
And like a box in the real world, it can have other boxes inside of it and these boxes can, in turn, contain more boxes. That way each box/component must have a single parent, and a parent can have many children.
The basic representation of a React component
The boxes are semi-permeable, meaning they never leak anything to the outside but can use information from the outside as if it belonged to them. I imagine like this to represent how closures work in JavaScript.
In React the way to share information between components is called props
, the same idea applies
to function and then it's called arguments
, they both work in the
same way but with a
different syntax.
Within components, information can only travel down from parents to children. In other words, children
can access their parent's data and state, but not the other way around, and the way we share that
information is through props
.
I imagine this directional sharing of information as boxes within boxes. With the inner-most box being able to absorb the parent's data.
Data is shared from parent to child
The box must first be created though, and this happens on render
,
where the default value is
given to state
and just like with functions, all the code within the
component is executed. In my
mental model, this is equivalent to the box being created.
Subsequent renders, or re-renders
, execute all the code in the
component again, recalculating
variables, recreating functions, and so on. Everything except for state
is brand new on each
render. State's value is maintained across renders is updated only through a set
method.
In my mental model, I see re-rendering as recycling the box since most of it is recreated, but it's still the same box due to React keeping track of the component's state.
When a box is recycled all the boxes within it, its children, are also recycled. This can happen because the component's state was modified or a prop changed.
Mental model of a React component re-rendering when props or state change
Remember that a state or prop changing means the information the user sees is outdated, and React always wants to keep the UI updated so it re-renders the component that must show the new data.
React helps us build complex, interactive UIs more easily than ever before. It also encourages us to write code in a certain way, guiding us to create apps that are simpler to navigate and understand.
React itself is a mental model with a simple idea at its core: encapsulate portions of your app that rely on similar logic and UI and React will make sure that portion is always up kept up to date.
Whether you've been working with React for years or are just starting, having a clear mental model is the best way to feel confident working with it. So for me to transfer my mental models to you I'll start from first-principles and build on top of them.
Let's start by modeling the basic building blocks of JavaScript and React: functions.
This is hidden away by JSX, the markup language React uses.  JSX is in itself an applied mental model that makes using React simpler and more intuitive.
Let's look at each part individually.
React is used with JSX—JavaScript XML—a way to write what seems as HTML with all of JavaScript's power. JSX offers a great applied mental model for using nested functions in a way that feels intuitive.
Let's ignore class components and focus on the far more common functional components. A functional component is a function that behaves exactly like any other JavaScript function. React components always return JSX which is then executed and turned into HTML.
This is what simple JSX looks like:
Li = props =>
{props.children}
;
export RickRoll = () => (

Never give you up

);
Which compiled into pure JavaScript by Babel:
Li = props => React.createElement('li', props, props.children);
export RickRoll = () =>
React.createElement(
'div',
null,
React.createElement(
'div',
{
className: 'wrapper',
},
React.createElement(
'ul',
null,
React.createElement(
Li,
{
color: 'red',
},
'Never give you up',
),
),
),
);
Now, notice how each component is a function calling another function, and each new component is the third
argument for the React.createElement
function. Whenever you write a
component, it's useful to
keep in mind that it's a normal JavaScript function.
An important feature of React is that a component can have many children but only one parent. I found this a
confusing until I realized it's the same logic HTML has, where each element must be inside other elements,
and can have many children. You can notice this in the code above, where there's only one parent
div
containing all the children.
When using a function we can use arguments to share information with that function. For React components we
call these arguments props
(funny story, I didn't realize props is
short for
properties for a long time).
Under the hood, props behave exactly like function arguments, the differences are that we interact
with them through the nicer interface of JSX, and that React gives extra functionality to props such as
children
.
Using this knowledge let's craft a mental model to intuitively understand functions!
When I think about a function I imagine it as a box, and that box will do something whenever it's called. It could return a value or not:
sum(a, b) {
return a + b;
}
console.log(sum(10, 20));
logSum(a, b) {
console.log(a + b);
}
Since a component is a fancy function, that makes a component a box as well, with props
as the
ingredients the box needs to create the output.
When a component is executed it will run whatever logic it has, if any, and evaluate its JSX. Any tags will become HTML and any component will be executed, and the process is repeated until reaching the last component in the chain of children.
Since a component can have many children but only one parent I imagine multiple components as a set of boxes, one inside another. Each box must be contained within a bigger box and can have many smaller boxes inside.
But the mental model of a box representing a component is not complete without understanding how it can interact with other boxes.
Closures are a core concept in JavaScript. They enable complex functionality in the language, they're super important to understand to have a good mental model around React.
They're also one of the features newcomers struggle with the most, so instead of explaining the technicalities I'll demonstrate the mental model I have around closures.
The basic description of a closure is that it's a function. I imagine it as a box that keeps what's inside of it from spilling out, while allowing the things outside of it from entering, like a semi-permeable box. But spilling out where?
While the closure itself is a box, any closure will be inside bigger boxes, with the outermost box being the Window object.
The window object encapsulates everything else
A closure is a feature of JavaScript functions. If you're using a function, you're using a closure.
As I've mentioned, a function is a box and that makes a closure a box too. Considering that each function can contain many others inside of it, then the closure is the ability of a function to use the information outside of it, while keeping the information it has inside from "spilling out", or being used by the outer function.
Speaking in terms of my mental model: I imagine the functions as boxes within boxes, and each smaller box can see the information of the outer box, or parent, but the big box cannot see the smaller one's information. That's as simple and accurate an explanation of closures as I can make.
"Each function can only access its own
Each function can only access its own information and the parent's
Closures are important because they can be exploited to create some powerful mechanics and React takes full advantage of this.
Each React component is also a closure. Within components, you can only pass props down from parent to child and the parent cannot see what's inside the child, this is an intended feature to make our app's data flow simpler to trace. To find where data comes from, we usually need to go up the tree to find which parent is sending it down.
A great example of closures in React is updating a parent's state through a child component. You've probably done this without realizing you were messing around with closures.
To start, we know the parent can't access the child's information directly, but the child can access
the parent's. So we send down that info from parent to child through props
. In this case, the
information takes the shape of a function that updates the parent's state.
Parent = () => {
[count, setCount] = useState(0);
return (

The count is {count}

<ChildButtons onClick={setCount} count={count} />

);
};
ChildButtons = props => (

<button onClick={() => props.onClick(props.count + 1)}>
Increase count
</button>
<button onClick={() => props.onClick(props.count - 1)}>
Decrease count
</button>

);
When an onClick
happens in a button
, that will execute the function received from
props props.onClick
, and update the value using props.count
.
The insight here lies in the way we're updating a parent's state through a child, in this case, the
props.onClick
function. The reason this works is that the function was
declared within the
Parent
component's scope, within its closure, so it will have
access to the parent's
information. Once that function is called in a child, it still lives in the same closure.
This can be hard to grasp, so the way I imagine it is as a "tunnel" between closures. Each has its own scope, but we can create a one-way communication tunnel that connects both.
Once we understand how closures affect our components, we can take the next big step: React state.
React's philosophy is simple: it handles when and how to render elements, and developers control what to render. State is our tool to decide that what.
When state changes, its component renders and therefore re-executes all the code within. We do this to show new, updated information to the user.
In my mental model state is like a special property inside the box. It's independent of everything else that happens within it. It will get a default value on the first render and always be up to date with the latest value.
Each variable and function is created on every render, which means their values are also brand new. Even if a
variable's value never changes, it is recalculated and reassigned every time. That's not the case with
state, it only changes when there's a request for it to change via a set
state
event.
State is a special, independent part of the box; with props coming from outside
State follows a simple rule: Whenever it changes it will re-rendered the component and its children. Props follow the same logic, if a prop changes, the component will re-render, however, we can control state by modifying it, props are more static and usually change as a reaction to a state change.
The Rendering Mental Model: understanding React's magic
I consider rendering to be React's most confusing part because a lot of things happen during rendering that sometimes isn't obvious by looking at the code. That's why having a clear mental model helps.
The way I imagine rendering with my imaginary boxes is two-fold: the first render brings the box into existence, that's when the state is initialized. The second part is when it re-renders, that's the box being recycled, most of it is brand new but some important elements of it remain namely state.
On every render, everything inside a component is created, including variables and functions, that's why we can have variables storing a calculation's results, since they will be recalculated on every render. It's also why functions are not reliable as values, due to their reference (the function's value, per se) being different every render.
Thumbnail = props => (

{props.withIcon && <AmazingIcon />}

);
The above will give a different result depending on the props the component receives. The reason React must re-render on every prop change is that it wants to keep the user up to date with the latest information.
However, the state doesn't change on re-renders, its value is maintained. That's why the box is "recycled" instead of created brand new every time. Internally, React is keeping track of each box and making sure its state is always consistent. That's how React knows when to update a component.
"When props (or state) changes, a new render happens and the component's output can change")]
When props (or state) changes, a new render happens and the component's output can change
By imagining a box being recycled I can understand what's going on inside of it. For simple components, it's easy to grasp, but the more complex a component becomes, the more props it receives, the more state it maintains, the more useful a clear mental model becomes.
Now that I've explained all the different parts of the puzzle separately, let's put it all together. Here's the complete mental model I use for React components, directly translated from how I imagine them into words.
I imagine a React component as a box that contains all of its information within its walls, including its children, which are more boxes.
And like a box in the real world, it can have other boxes inside of it and these boxes can, in turn, contain more boxes. That way each box/component must have a single parent, and a parent can have many children.
The basic representation of a React component
The boxes are semi-permeable, meaning they never leak anything to the outside but can use information from the outside as if it belonged to them. I imagine like this to represent how closures work in JavaScript.
In React the way to share information between components is called props
, the same idea applies
to function and then it's called arguments
, they both work in the
same way but with a
different syntax.
Within components, information can only travel down from parents to children. In other words, children
can access their parent's data and state, but not the other way around, and the way we share that
information is through props
.
I imagine this directional sharing of information as boxes within boxes. With the inner-most box being able to absorb the parent's data.
Data is shared from parent to child
The box must first be created though, and this happens on render
,
where the default value is
given to state
and just like with functions, all the code within the
component is executed. In my
mental model, this is equivalent to the box being created.
Subsequent renders, or re-renders
, execute all the code in the
component again, recalculating
variables, recreating functions, and so on. Everything except for state
is brand new on each
render. State's value is maintained across renders is updated only through a set
method.
In my mental model, I see re-rendering as recycling the box since most of it is recreated, but it's still the same box due to React keeping track of the component's state.
When a box is recycled all the boxes within it, its children, are also recycled. This can happen because the component's state was modified or a prop changed.
Mental model of a React component re-rendering when props or state change
Remember that a state or prop changing means the information the user sees is outdated, and React always wants to keep the UI updated so it re-renders the component that must show the new data.
JavaScript Library for building User Interfaces
<canvas>
rendering for React components
Framework for building native apps using React
Predictable State Container for JavaScript Apps
Simple, scalable state management for JavaScript Apps
Query Language
Data-Driven React Applications
Data stack based on GraphQL


About me
Personal info
- My name is Gabe Altenberger
- I am 19 years old from Brier, Washington.
Hobbies
- Shoot hoops.
- Play my guitar.
- Hang out with friends.
My Top 10 Favorite Foods!
- Pizza
- Pad Thai
- Tacos
- BBQ Burger
- Chicken Teriaki
- Chicken Alfredo Pasta
- Grapes
- Vanilla Ice Cream
- Rasberries
- Oranges


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Fullname
Email
Phone
Feedback Type
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Description
Submit
Contact Information
Lagos, Nigeria
|080| xxx-xxx-xxx
<EMAIL_ADDRESS>Home
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Contact Us
+2347099883362
Lagos, Nigeria
taxit@mail.com


{% load i18n %}
{% blocktrans with 'https://github.com/getsentry/raven-csharp' as link %}Start by installing raven-csharp:{% endblocktrans %}
{% blocktrans %}Initialize the client:{% endblocktrans %}
ravenClient = new RavenClient('{% if dsn %}{{ dsn }}{% else %}SENTRY_DSN{% endif %}');
{% blocktrans %}To capture errors, you'll need to wrap your code in a simple try/catch block:{% endblocktrans %}
try { int i2 = 0; int i = 10 / i2; } catch (Exception e) { ravenClient.CaptureException(e); }
{% blocktrans with 'https://github.com/getsentry/raven-csharp' as link %}For more information on other uses of Raven with C#, please see the official documentation for raven-csharp.{% endblocktrans %}


To calculate the MyRisk, an individual must input 3 variables: gender, age-range, and ethnicity. In order to calculate the total probability of one of the variables, we must first calculate the total amount of deaths for a variable range divided by the total deaths for the state of California. After calculating the probability for each of the 3 variables, the variables must be multiplied together; this calculates the total probability. The total population for individuals who fulfill the 3 variables, is then determined. Using this 3-variable specific population, the total deaths are then divided by that specific population and the overall risk for the individual is calculated.
Data for all the information visualizations used for the Analytics page is collected from the California Department of Public Health Database. The analytics data has been collected and stored into CSV files, which can be downloaded below.
Data for all of the MyRisk Section, such as populations for gender, ethnicity, and age groups, was collected from the US Census Database


"HART "(Hebrews ‘ayal), a stag or male deer. It is ranked among the clean animals (Deuteronomy 12:15; 14:5; 15:22), and was commonly killed for food (1 Kings 4:23). The hart is frequently alluded to in the poetical and prophetical books (Isaiah 35:6; Cant. 2:8, 9; Lamentations 1:6; Psalm 42:1).
"HART "(Hebrews ‘ayal), a stag or male deer. It is ranked among the clean animals (Deuteronomy 12:15; 14:5; 15:22), and was commonly killed for food (1 Kings 4:23). The hart is frequently alluded to in the poetical and prophetical books (Isaiah 35:6; Cant. 2:8, 9; Lamentations 1:6; Psalm 42:1).


QuaranGreen is a student-led Massachusetts-based organization that promotes healthy eating habits and works to reduce anxiety during the COVID-19 pandemic.
In flattening the curve of physical interaction with quarantine, we have ensued a spike in poor eating habits, loss of community, and artificial isolation. Cooped up inside homes laden with non-perishable soups and premade meals, it is easy to lose sight of a healthy diet when making meals at home. Furthermore, it can be difficult to access fresh produce when stores are limited on supplies and citizens are limited in their travel.
QuaranGreen works to curve all of these aspects of an unhealthy lifestyle with a simple and easy first step: growing a lettuce plant. Our goal is to distribute potted lettuce plants to households throughout our community inorder to provide a first step in creating a personal produce source, build friendly community bonding, and reduce stress.
Matt Tengtrakool
Founder and CEO of QuaranGreen Inc.
QuaranGreen was founded by Matt on March 10th with the purpose of educating local communities about environmental methods of maintaining physical and mental health during the COVID-19 crises.
His inspiration arose from his environmental roots as an Eagle Scout and passionate agriculturalist. He is an avid social entrepreneur leading multiple successful community-driven startup organizations working to serve and address the vulnerable populations of local communities.
Matt's message is to convert activism into action and hopes to inspire other young people to take charge of the changes they wish to see.


Changing the Document Owner
How to change the name of the document owner or leave the owner field blank on the Documents module.
- Click the Edit button located to the left of the document to be modified.
- At Owner, click the Change Owner link.
- Select from these options:
- Select the new owner from the drop down list.
- Select None Specified to leave the owner name blank for this record.
- Click the OK button to confirm.


Web Application Checklist
Status:
WIP
Actions:
Export
Import
Reset
Load
0%
Information Gathering
Crawling / Identify Default Directories
Technologies in use
HTTP Headers
Information Disclosure through Error Messages
Outdated Libraries
Directory Listing Enabled
User Roles
User Enumeration
Business Logic
Input Validation / Injections
Cross-Site Scripting (XSS)
SQL / NoSQL Injections
Server Side Includes
Server Side Request Forgery
Cross Site Request Forgery
CORS
XML / LDAP / Command Injection
Open Redirect
Path Traversal
Local / Remote File Includes
HTTP Request Smuggling
Session
Session ID Entropy
Improper Session Termination
Session Fixation
Cookies Poisoning
Clickjacking
Session Cookies Without Flags
HTTP Strict Transport Security
Cryptography
Algorithms & Ciphers
Self-Signed Certificates
Improper Password Storage
Lack of SSL
Authorization
User Segregation
Insecure Direct Object Reference
Default / Easily Guessable Passwords
Hardcoded Credentials in Files
No Brute Force Protection
Unauthenticated Admin Access
Unrestricted File Upload
Lack of Antivirus Solution
Denial of Service
Account Lockout
Cache Poisoning


OMERO workshop
TOPIM TECH
Chania, July 2018
Will Moore, Petr Walczysko
Today's workshop
Outline
- 11:20 - 12:55 (1 hour 35 mins)
- Introduction to OMERO
- CellProfiler analysis
- 13:25 - 14:10 (45 mins)
- Image analysis in Orbit
- Coding in Orbit
- Lunch
- 18:00 - 18:45 (45 mins)
- Fiji analysis
- Python script
- R analysis
- 19:10 - 20:15 (1 hour 5 mins)
- OMERO.parade
- OMERO.figure
Client-side vs Server-side analysis
Analysis data in OMERO
- OMERO.tables
- HDF tables
- 1 row per Image / Well - flexible columns
- Saved as a File-Annotation
-
Regions of Interest (ROIs)
- Contain 1 or more Shape e.g. Polygon
-
Map Annotations
- List of Key: Value pairs
- Each map annotation linked to 1 object
Session 1: OMERO intro & CellProfiler
- OMERO.webclient
- Browse data
- View images
- Add annotations
-
CellProfiler
Session 2: Orbit
- Orbit as an OMERO client, using Java API
- Create a segmentation model in Orbit
- Saved as a File Annotation to OMERO
- Segment an Image, save Polygons as OMERO ROIs
- Use Orbit script editor to access OMERO Java API
Session 3: Fiji, python scripts & R
- Fiji as an OMERO client, using Java API
- Segment images, save Polygons as OMERO ROIs
- Python script on OMERO server summarises ROIs to OMERO.table
- Analyse OMERO.table data in R, plot results
Session 4: OMERO.web: parade & figure
- OMERO.parade: app for filtering and plotting data
- Uses OMERO.table data from Fiji/Python scripts previously
- OMERO.figure: tool for creating figures
- Uses metadata for speed & accuracy
- ROIs, Channel names, Pixel sizes, Tags etc.
Getting started
Importing Images...
In-place import
Files remain in-place during import
# e.g. Transfer file using 'soft' link
$ bin/omero import -- --transfer=ln_s image.lsm
In-place import docs


<blockquote> tag:
Even though the bockquote start tag contains the cite attribute, this entire section must be indented from the rest of the text in the file. This is some text to fill up the space. This is some text to fill up the space. It should still be indented no matter how many lines long it is. This is some more text. This is some more text. This is some more text.