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The freeCodeCamp curriculum and lesson editor
License: Creative Commons Attribution Share Alike 4.0 International
In the challenge, "Applied Visual Design: Use the u Tag to Underline Text", there is text that should be changed to make more sense.
It says:
Wrap the
u
tag around the text "Ph.D. students". It should not include the parentdiv
that has the class ofcardText
.
I think the second sentence should be removed. It is confusing and adds nothing to the challenge.
Describe the bug
This test requires to use only "
around the path_to_file
for the solution but I think that '
should work too.
Screenshots
If applicable, add screenshots to help explain your problem.
Desktop (please complete the following information):
Additional context
Bug:
In the challenge description, the examples of valid phone number formats are not presented on separate lines as expected.
Link to the challenge: https://learn.freecodecamp.org/javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/telephone-number-validator
Solution:
This is because HTML doesn't render \n
to a new line, but a single space instead. We can fix it by replacing all the \n
characters with <br>
tags. Here is the line that needs to be edited:
@Nirajn2311 commented on Thu Jun 28 2018
The instructions instruct us to create a function timesFive but it doesn't tell us to call the function after creating it. So when anyone does the challenge they will get an error.
I think that the instructions should be modified to include all steps.
@Bouncey @raisedadead can I make a PR on this in the curriculum repo?
Describe the bug
You can complete the challenge by just adding the new element to the root if it is null.
This is all the code that you need to complete the challlenge
this.add = function (element) {
if(!this.root){
this.root = new Node(element)
}
}
Describe the bug
A clear and concise description of what the bug is.
The guide in the first challenge contains the same redundant text from the second challenge.
To Reproduce
Steps to reproduce the behavior:
Expected behavior
A clear and concise description of what you expected to happen.
Screenshots
If applicable, add screenshots to help explain your problem.
Desktop (please complete the following information):
Additional context
Add any other context about the problem here.
This is the redundant text.
Take for example Bootstrap's........................wide the element should be.
@thefifthisa commented on Wed Jun 13 2018
Minor thing, but I think it would improve readability if the sample code below was properly indented like in other lesson descriptions.
https://learn.freecodecamp.org/javascript-algorithms-and-data-structures/es6/prevent-object-mutation
@Nirajn2311 commented on Wed Jun 13 2018
I’ll see what I can do about it.
@Nirajn2311 commented on Fri Jun 15 2018
There is a mistake in this challenge's code of FCC's curriculum node_module
Describe the bug
The issue template bolds headings (**heading**)
To Reproduce
Steps to reproduce the behavior:
Expected behavior
It would be more semantically correct to use #
s. This could also make navigation either on some users' set-ups (e.g. if they have certain things set up to mark out headings)
Describe the bug
With my code, elements display correctly, and devtools shows that the font-size
s for all .text-#{$x}
elements is correct. However, the tests do not pass.
To Reproduce
style
tags, add: $x: 1;
@while $x <= 10 {
.text-#{$x} { font-size: 5px * $x; }
$x: $x+ 1;
}
Expected behavior
Tests should pass.
Desktop (please complete the following information):
Additional context
A similar issue is filed here: freeCodeCamp/freeCodeCamp#17838
I think this is now the preferred place to post it.
Note that if this was a browser-induced minimum font-size issue, it seems like the larger font tests would work, even if the 5px test did not.
Update:
Tests pass on this challenge when the spacing is tweaked. This spacing passed for me:
$x: 1;
@while $x <= 10 {
.text-#{$x} { font-size: 5px * $x;
}
$x: $x+ 1;
}
This challenge can be passed without doing any work.
Steps to reproduce the behavior:
This challenge will need to be completed before it can be passed.
This was submitted a while ago on forum too: https://forum.freecodecamp.org/t/create-grids-within-grids/198349
Describe the bug
Socket.io challenges in Advanced Node and Express are missing an intro, and description about what the challenge is doing. It looks almost as if there is a challenge missing in between "Social Auth III" and "setting up the environment". I say this because the part in which you set up the http variable is missing as well, which makes the first instructions confusing, as you don't have the http variable in the code yet.
from challenge:
Add Socket.IO as a dependency and require/instantiate it in your server defined as 'io' with the http server as an argument.
const io = require('socket.io')(http);
To Reproduce
Link to first challenge in Socket.io series:
https://learn.freecodecamp.org/information-security-and-quality-assurance/advanced-node-and-express/set-up-the-environment
Desktop (please complete the following information):
Describe the bug
Incorrect guidance to the user to change code 'below this line' when it should be 'above'
To Reproduce
Steps to reproduce the behavior:
Expected behavior
Line 6 should read:
// change code above this line
Happy to fix this minor issue.
Describe the bug
The challenge throws browser console errors if you manually define an explicit new state. It works if you just pass return {login: true};
. It can be confusing to the user, since there was no mention of such restrictions, nor is the real error visible without opening the browser console ... which then looks like a pipeline issue. And for complexer states, typing out the whole structure just to change one property is an antipattern.
To Reproduce
https://learn.freecodecamp.org/front-end-libraries/redux/handle-an-action-in-the-store
let newState = { ...state };
newState.login = true;
return newState;
Expected behavior
I think it's enough to add another line to the challenge text telling the users to just return a new anonymous state object.
Desktop (please complete the following information):
The regex lets you pass in a double quote to start the url and a single quote to finish it. It also doesn't let you pass in the url without quotes even though that is also valid css.
The challenge in question is here.
Type in your background as background: url('https://i.imgur.com/MJAkxbh.png")
and the test passes.
I am going to take care of this one.
Describe the bug
The challenge text mentions title
and rating
, but the actual objects have Title and imdbRating, as in the previous ones.
@mstellaluna commented on Fri May 18 2018
Challenge Name
https://learn.freecodecamp.org/responsive-web-design/basic-html-and-html5/nest-an-anchor-element-within-a-paragraph
Issue Description
In the lesson text opens to freecodecamp.org website in the same tab. My suggestion is to have it open to a new tab so the camper does not lose lesson they are on.
Browser Information
Browser Name, Version:
Firefox Quantum 60.0.1 (64-bit)
Chrome: Version 66.0.3359.117 (64-bit)
Operating System: Windows 10 Pro 64-bit
Mobile, Desktop, or Tablet: Dell Latitude Laptop (15")
@beaucarnes commented on Fri May 18 2018
Normally I agree that links should open in a different tab but in this case I don't think it should open to a new tab. This is an example of the type of link that does not open into a new tab. If it opened into a new tab, it would be using HTML that is different than the HTML that the lesson text says it is an example of.
@mstellaluna commented on Fri May 18 2018
@beaucarnes Agreed, although if a camper though decides to click on that link as it is an active link, it will bring them to the freecodecamp.org website in the same tab they are viewing the lesson.
@Bouncey commented on Fri Jun 15 2018
We could change the example to use a _blank
. Ideally, we don't want to take users away from their lesson. I don't think there will be many queries over the target
attribute.
Notes to contributors, this should be fixed in the freecodecamp/curriculum repository, the code is not held in learn.
@beaucarnes commented on Fri Jun 15 2018
I agree with both of you now. I noticed that target="_blank"
is introduced in the previous lesson so hopefully people will understand when it is used in this lesson.
Describe the bug
Text for first test should be amended to say array rather than list as this is both what we specify and test for.
Second test only passes if you use double quotes around class attribute
The test for use of template literals has an incorrect regex. The part of the regex testing for </li>
has not been properly escaped so /
is being treated as end of the regex, with l
being treated as a regex flag.
There maybe additional issues with the regex, so I will try and identify all before submitting PR to fix.
To Reproduce
Steps to reproduce the behavior:
Run the Tests
Expected behavior
Test should pass
Desktop (please complete the following information):
Reported by multiple campers - not system specific
Referencing Issue #17387 in freeCodeCamp/freeCodeCamp:
In the "Debugging: Understanding the Differences between the freeCodeCamp and Browser Console" challenge, a correct solution cannot pass because of a test failing due to the following:
// running test
invalid regexp group
// tests completed
It has been determined that this is likely because the negative look behind regular expression used is not fully implemented in Firefox yet.
To Reproduce
Steps to reproduce the behavior:
Expected behavior
The challenge should pass if the regular expression in the test is changed (this will be duplicating a PR that was closed under freeCodeCamp/freeCodeCamp so that it can be implemented here).
Desktop (please complete the following information):
A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
https://learn.freecodecamp.org/coding-interview-prep/data-structures/create-a-map-data-structure/.
Instructions for 'has' method in the challenge is pretty ambiguous unlike descriptions of other methods in the same challenge. It lacks proper explanation of what the method is expecting.
A clear and concise description of what you want to happen.
Change the text from "has returns a boolean for the presence or absence of an item" to "has accepts a key and returns true or false based on the presence of a key"
A clear and concise description of any alternative solutions or features you've considered.
None.
Add any other context or screenshots about the feature request here.
Describe the bug
In the ES6 hint at the end.
To Reproduce
https://learn.freecodecamp.org/front-end-libraries/redux/create-a-redux-store
I have noticed that a number of the challenges do not have any solutions that are being tested, namely the Responsive Web Design challenges. This became apparent to me recently when I had submitted a pull request that passed all the tests, but had a typo in it that would have broken the updated challenge. Luckily @scissorsneedfoodtoo caught it and the bug was avoided. (#167)
I understand that in many cases it is not possible to test solutions because the assertions rely on elements in the DOM, but there are some tests that only match your code to a regex expression, and these could be tested as in the example below
Test:
"assert(code.match(/background:\\s*?linear-gradient\\(35deg,\\s*?(#CCFFFF|#CFF),\\s*?(#FFCCCC|#FCC)\\);/gi), 'The <code>div</code> element should have a <code>linear-gradient</code> <code>background</code> with the specified direction and colors.');"
Solution:
"var code = \"<style> div{border-radius: 20px; width: 70%; height: 400px; margin: 50px auto; background: linear-gradient(35deg, #cff, #fcc);}</style><div></div>\""
I would love to work on adding these solutions that are possible, and I will get started on it. Are there any plans to make the assertions that rely on the DOM testable? Because it would be ideal to have every challenge tested to minimize the chances for human error.
@SuperGeniusZeb commented on Fri Jun 01 2018
The instructions of this lesson include invalid HTML: there are <hr>
, <li>
, and <ul>
tags nested in <p>
tags. Paragraph elements only allow phrasing content to be nested in them, but <hr>
, <li>
, and <ul>
tags are all flow content.
<div class="challenge-instructions col-xs-12">
<p class="wrappable">Have you noticed that all of the applied accessibility challenges so far haven't used any CSS? This is to show the importance of a logical document outline, and using semantically meaningful tags around your content before introducing the visual design aspect.</p>
<p class="wrappable">However, CSS's magic can also improve accessibility on your page when you want to visually hide content meant only for screen readers. This happens when information is in a visual format (like a chart), but screen reader users need an alternative presentation (like a table) to access the data. CSS is used to position the screen reader-only elements off the visual area of the browser window.</p>
<p class="wrappable">Here's an example of the CSS rules that accomplish this:</p>
<div>
<blockquote>.sr-only {<br> position: absolute;<br> left: -10000px;<br> width: 1px;<br> height: 1px;<br> top: auto;<br> overflow: hidden;<br>}</blockquote>
</div>
<p class="wrappable"><strong>Note</strong><br>The following CSS approaches will NOT do the same thing:</p>
<p class="wrappable">
<ul></ul>
</p>
<p class="wrappable">
<li><code>display: none;</code> or <code>visibility: hidden;</code> hides content for everyone, including screen reader users</li>
</p>
<p class="wrappable">
<li>Zero values for pixel sizes, such as <code>width: 0px; height: 0px;</code> removes that element from the flow of your document, meaning screen readers will ignore it</li>
</p>
<p class="wrappable"></p>
<p class="wrappable">
<hr>
</p>
<p class="wrappable">Camper Cat created a really cool stacked bar chart for his training page, and put the data into a table for his visually impaired users. The table already has an <code>sr-only</code> class, but the CSS rules aren't filled in yet. Give the <code>position</code> an absolute value, the <code>left</code> a -10000px value, and the <code>width</code> and <code>height</code> both 1px values.</p>
</div>
Also notable is that the <blockquote>
element contains code which should be wrapped in a <code>
element for semantic purposes.
HTML 5.2 specifications and HTML 5.3 drafts for reference:
@SuperGeniusZeb commented on Thu May 31 2018
This lesson teaches that the <del>
element represents "a section of text is no longer valid". However, according to the HTML spec, that is the purpose of the <s>
element. The <del>
element is supposed to be used to represent text that has been deleted from a document during an edit (similar to the <ins>
element which represents content that has been added in by an edit).
See also:
https://developer.mozilla.org/en-US/docs/Web/HTML/Element/del
https://developer.mozilla.org/en-US/docs/Web/HTML/Element/s
https://www.w3.org/TR/html52/edits.html#the-del-element
https://www.w3.org/TR/html53/edits.html#the-del-element
https://www.w3.org/TR/html52/textlevel-semantics.html#the-s-element
https://www.w3.org/TR/html53/textlevel-semantics.html#the-s-element
https://html.spec.whatwg.org/multipage/edits.html#the-del-element
https://html.spec.whatwg.org/multipage/text-level-semantics.html#the-s-element
@SuperGeniusZeb commented on Thu May 31 2018
This lesson currently uses the old CSS2 pseudo-element syntax: thing:pseudo-element
. It should be updated to use the CSS3 syntax: thing::pseudo-element
.
See also:
https://developer.mozilla.org/en-US/docs/Web/CSS/pseudo-elements
https://drafts.csswg.org/selectors-3/#pseudo-elements
@Bouncey commented on Fri Jun 15 2018
There is a difference between :
and ::
.
:
is for pseudo classes like :hover
and :focus
::
is for pseudo elements like ::before
and ::after
In most cases it doesn't really matter
I would be happy to see the changes made in freeCodeCamp/curriculum though 👍
Describe the bug
2 incorrect assertions on the following challenge make it impossible to pass (at least without cheating).
To Reproduce
Just follow the instructions for this set of challenges, there is no way to miss it.
Expected behavior
Test should perform correct assertion.
Screenshots
Here are some screens with dev tools:
Desktop (please complete the following information):
Irrelevant
At the minute we aren't able to use the curriculum from v3.1.2 onwards. This is because of a breaking change that has broken the tests on the main repo.
We need to evaluate the changes introduced in #127 and consolidate the schema for the changes both curriculum and main repo side.
Todo:
releasedOn
necessary? This is one of the keys breaking tests./cc @Bouncey @scissorsneedfoodtoo can we get on a call to discuss further?
freeCodeCamp/freeCodeCamp#17951 still persists
I just found a duplicated CSS top
property in Applied Visual Design: Make Motion More Natural Using a Bezier Curve, is this intended?
.balls {
border-radius: 50%;
top: 249px;
position: fixed;
width: 50px;
height: 50px;
top: 60%;
animation-name: jump;
animation-duration: 2s;
animation-iteration-count: infinite;
}
master
branch failed. 🚨I recommend you give this issue a high priority, so other packages depending on you could benefit from your bug fixes and new features.
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Describe the bug
A challenge "Note" indicates that "In most cases, the file path requires a ./
before it; otherwise, node will look in the node_modules
directory first trying to load it as a dependency."
Furthermore, the challenge instructions state that "The file where this function lives is called "string_functions"
, and it is in the same directory as the current file."
Therefore, users should expect the/a correct answer involves "./string_functions"
.
However, including ./
before the file name causes the challenge to fail.
To Reproduce
import { capitalizeString } from "./string_functions";
below "use strict";
Cannot read property 'capitalizeString' of undefined
error.import { capitalizeString } from "string_functions";
Expected behavior
The challenge should pass when the user includes ./
in front of the imported filename. Or, the challenge should specify that the "string_functions"
file lives in the node_modules
directory or that no ./
is needed in this challenge.
Desktop (please complete the following information):
Additional context
Subsequent ES6 challenges share this problem, but I will hold on filing issues for them until this one is resolved.
A couple of the challenges in Applied Visual Design won't pass if you omit the unit on a zero value.
Challenges in question:
https://learn.freecodecamp.org/responsive-web-design/applied-visual-design/create-movement-using-css-animation
https://learn.freecodecamp.org/responsive-web-design/applied-visual-design/use-a-css-linear-gradient-to-create-a-striped-element
I will take care of this one
The following fails:
app.get("/json", (req, res) => { let message = ""; (process.env.MESSAGE_STYLE == "uppercase") ? message=message.toUpperCase() : message="Hello json"; res.json({"message": message}); });
And this works:
app.get("/json", (req, res) => { let message = "Hello json"; (process.env.MESSAGE_STYLE == "uppercase") ? message=message.toUpperCase() : message=message; res.json({"message": message}); });
They are basically the same code. I'm not sure how the testing is done but the first code segment should work fine. It is not a big deal, although I am sure fixing this should save some people a little frustration.
https://learn.freecodecamp.org/apis-and-microservices/basic-node-and-express/use-the--env-file
Describe the bug
The instructional text in the "ES6: Use getters and setters to Control Access to an Object" challenge includes console.log(lol.writer);
twice but lacks comments to indicate the different results.
To Reproduce
Steps to reproduce the behavior:
Expected behavior
The first console.log(lol.writer);
should have a comment that reads // anonymous
The second console.log(lol.writer);
should have a comment that reads // wut
Desktop (please complete the following information):
Additional context
This bug was reported in the freecodecamp repo, below are the full details to it.
In the Front End Libraries Certification: React Challenge there is a challenge named
Introducing Inline Styles
in which there's a link to an article and when I click in the link it redirects me to a 404 page. That means the page does not exist anymore.
The test case on this challenge does not make sense since it repeated --penguin-skin
three times when it is supposed to be --penguin-skin
, --penguin-belly
, --penguin-beak
To Reproduce
Steps to reproduce the behavior:
Expected behavior
The test case on this challenge does not make sense since it repeated --penguin-skin
three times when it is supposed to be --penguin-skin
, --penguin-belly
, --penguin-beak
.
Desktop (please complete the following information):
Additional context
Up to date source code seems wrong too: https://github.com/freeCodeCamp/curriculum/blob/dev/challenges/01-responsive-web-design/basic-css.json#L4564-L4570
Describe the bug
Current incorrect sentence
We want you to return the updated document. o do that you need to pass the options document { new: true } as the 3rd argument to findOneAndUpdate().
Expected sentence
We want you to return the updated document. To do that you need to pass the options document { new: true } as the 3rd argument to findOneAndUpdate().
Screenshots
Describe the bug
Two lines that say change code below this line
sandwich the line with the comment change this
.
The bottom one should say change code above this line
.
To Reproduce
Expected behavior
The bottom comment should say change code above this line
: above
, not below
.
Desktop (please complete the following information):
Additional context
Is your feature request related to a problem? Please describe.
On my computer, compiling learn takes several minutes (usually 5-10) and waiting this long to view a change with curriculum is just impractical when making minor adjustments.
Describe the solution you'd like
I'd like to be able to run something similar to unpacked
, but there is an editor, and the learning tests (i.e buffer should be 64 bytes) can be run. It should not affect learn progress. This can be done by, when unpacking (maybe a different kind of unpack?), parsing the tests
section of the challenge, and converting it to the TAP test syntax. (I have no idea how that would be repacked, however. Probably some very structured comments, like the whole<!--description-->
stuff.)
Describe alternatives you've considered
Testing it normally with learn, and using the unpacked version, but using the test suite to test pre-written code.
Additional context
My computer is rather old, so this is really just a convenience thing. Maybe I'm the only one who's developing with such a slow computer, and for everyone else, running learn takes a few seconds.
Many thanks.
Describe the bug
Challenge suggest the following code to hash a password:
var hash = bcrypt.hash(req.body.password, 12);
... and than saving the hash variable to the database, but this code returns a promise and therefore cannot be saved as password. So we need to handle the promise and then save the response as password, or the second solution would be to change the code and use hashSync method.
To Reproduce
Steps to reproduce the behavior:
var bcrypt = require('bcrypt');
var hash = bcrypt.hash('some_password', 12);
console.log(hash) // returns a Promise instead of a hash
Expected behavior
The code should return a hashed password
Desktop (please complete the following information):
Additional context
I can work on this and will make a PR if you agree this challenge needs to refactor...
Describe the bug
.red-box margin does not match .green-box margin; and instead matrches .yellow-box margin.
.yellow-box {
background-color: yellow;
padding: 20px 40px 20px 40px;
}
.red-box {
background-color: red;
margin: 20px 40px 20px 40px;
}
.green-box {
background-color: green;
margin: 40px 20px 20px 40px;
}
To Reproduce
Steps to reproduce the behavior:
Expected behavior
Make .red-box margin match .green-box margin
To my understanding, it should match .green-box for consistency to match its sibling and not it's parent .yellow-box.
Describe the bug
The regex string to test is the user has correctly used template literals is incorrect and the test fails when it should not.
Some of the escape characters in the string are not correctly entered, causing the error.
To Reproduce
Steps to reproduce the behavior:
Expected behavior
The test should pass when template literals are correctly used.
Screenshots
If applicable, add screenshots to help explain your problem.
Desktop (please complete the following information):
I'm happy to correct this issue.
The problem does not specify a pre-increment (++myVar
) or post-increment (myVar++
).
One test:
{
"text": "Use the <code>++</code> operator",
"testString":
"assert(/[+]{2}\\s*myVar|myVar\\s*[+]{2}/.test(code), 'Use the <code>++</code> operator');"
},
allows either, but another test:
{
"text": "<code>myVar = myVar + 1;</code> should be changed",
"testString":
"assert(/var\\s*myVar\\s*=\\s*87;\\s*\\/*.*\\s*myVar\\+\\+;/.test(code), '<code>myVar = myVar + 1;</code> should be changed');"
},
fails for pre-increment.
The problem description should either say specifically "post" or the tests should allow either.
A fair number of campers are getting tripped up on this.
Describe the bug
When running npm run unpack
, then npm run repack
, translations gets deleted from challenge json file
To Reproduce
Steps to reproduce the behavior:
npm run unpack
npm run repack
Expected behavior
Translations should not get deleted from json files
Screenshots
If applicable, add screenshots to help explain your problem.
Desktop (please complete the following information):
Additional context
clickjacking exercise shows an iframe and some of the description is missing as there are html elements in the description.
Steps to reproduce the behavior:
I expect to see the full description without an iframe.
I've attempted solving this exercise several times. The solution to solving this exercise is relatively simple, it just requires an <hr>
tag to be placed between the <h4>
title tag and the first <p>
tag that follows it.
However, when submitting this solution, once of the tests fail:
"The hr tag should come between the title and the paragraph."
I've also attempted to take the following exercises code and paste it into the IDE as well, but it didn't work either.
I've included screen shots below
Steps to reproduce the behavior:
Both tests should pass
Describe the bug
Using <code>
tags to show new terminology (rather than to refer to code) has caused confusion to campers, as filed in freeCodeCamp/freeCodeCamp#17655. These tags do cause confusion. <code>
tags, semantically, are meant to refer to code.
However, these are used in almost every challenge. For example, the terminology "getter" and "setter" is not code (there is no keyword called getter
, nor setter
), and yet it is used in a challenge.
More evidence:
Challenge | Bad words in code tags |
---|---|
Make Dead Links using the Hash Symbol | JavaScript |
Global Scope and Functions | global |
Reuse Patterns using Capture Groups | capture groups |
There are many more examples, and I will edit the above table when I get the time to search for more. What we need to do is:
Thoughts?
Some potential contributors are having a problem with the Travis CI test which is checking for commit formats, but this is undocumented.
This repo should have a CONTRIBUTING.md file I guess containing this sort of information?
I am not really aware of the circumstances of moving from the old repo to this new repo- maybe it is appropriate to simply link to the CONTRIBUTING.md file from the old repo.
In the challenge Functional Programming: Introduction to Currying and Partial Application
Some of the example code is incorrect:
With the example curried function provided earlier in challenge the 3rd line will not work as funcForZ is not a function.
thanks to @mpmaan for raising on Gitter
Describe the bug
The current description contains this sentence.
If don’t know what a middleware is, don’t worry.
It should be
If you don't...
To Reproduce
Steps to reproduce the behavior:
If don't
on the web page.A declarative, efficient, and flexible JavaScript library for building user interfaces.
🖖 Vue.js is a progressive, incrementally-adoptable JavaScript framework for building UI on the web.
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
An Open Source Machine Learning Framework for Everyone
The Web framework for perfectionists with deadlines.
A PHP framework for web artisans
Bring data to life with SVG, Canvas and HTML. 📊📈🎉
JavaScript (JS) is a lightweight interpreted programming language with first-class functions.
Some thing interesting about web. New door for the world.
A server is a program made to process requests and deliver data to clients.
Machine learning is a way of modeling and interpreting data that allows a piece of software to respond intelligently.
Some thing interesting about visualization, use data art
Some thing interesting about game, make everyone happy.
We are working to build community through open source technology. NB: members must have two-factor auth.
Open source projects and samples from Microsoft.
Google ❤️ Open Source for everyone.
Alibaba Open Source for everyone
Data-Driven Documents codes.
China tencent open source team.