bigsergey

Review checklist

General

1. Does the code work?
2. Description of the project status is included.
3. Code is easily understand.
4. Code is written following the coding standarts/guidelines (React in our case).
5. Code is in sync with existing code patterns/technologies.
6. DRY. Is the same code duplicated more than twice?

ducdigital

let Component = {};

_.flowRight([
  function helpers(extradata) {
    return function (Component) {
      console.log('helpers component', Component);
      Component.helpers = 'passedHelpers';
      Component.extradata = extradata;
      return Component;

mpj

Thoughts on Templating languages

I get a lot of questions about what I think about Vue.

I won't comment too much on Vue in general because I'm not familar enough with it, but I'm very familiar with templating systems, and in articles praising Vue, the fact that it uses templating system instead of JSX is almost always cited as a reason to choose Vue. This drives me up the friggin' wall, because the negative side effects of templates are not communicated or discussed. JSX exists for good reasons. To me, JSX is a great simplification and clear improvement over templates.

Template languages are often sold on looking superficially good. I recently ran across yet another one of these articles citing the wonders of Vue, and especially templates. In this article, this JSX example is included:

myshov

console.log(1);
(_ => console.log(2))();
eval('console.log(3);');
console.log.call(null, 4);
console.log.apply(null, [5]);
new Function('console.log(6)')();
Reflect.apply(console.log, null, [7])
Reflect.construct(function(){console.log(8)}, []);
Function.prototype.apply.call(console.log, null, [9]);
Function.prototype.call.call(console.log, null, 10);

jesperorb

Handle CORS Client-side

Cross-origin resource sharing (CORS) is a mechanism that allows restricted resources (e.g. fonts) on a web page to be requested from another domain outside the domain from which the first resource was served. This is set on the server-side and there is nothing you can do from the client-side to change that setting, that is up to the server/API. There are some ways to get around it tho.

Sources : MDN - HTTP Access Control | Wiki - CORS

CORS is set server-side by supplying each request with additional headers which allow requests to be requested outside of the own domain, for example to your localhost. This is primarily set by the header:

Access-Control-Allow-Origin

jacob-beltran

// How to ensure that our animation loop ends on component unount

componentDidMount() {
  this.startLoop();
}

componentWillUnmount() {
  this.stopLoop();
}

odewahn

I really liked @tjvantoll article Handling Failed HTTP Responses With fetch(). The one thing I found annoying with it, though, is that response.statusText always returns the generic error message associated with the error code. Most APIs, however, will generally return some kind of useful, more human friendly message in the body.

Here's a modification that will capture this message. The key is that rather than throwing an error, you just throw the response and then process it in the catch block to extract the message in the body:

fetch("/api/foo")
  .then( response => {
    if (!response.ok) { throw response }
    return response.json()  //we only get here if there is no error
 })

forabi

❯ rollup --version
rollup version 0.25.3

❯ time rollup -c ./rollup.js                      
rollup -c ./rollup.js  4.65s user 0.22s system 118% cpu 4.131 total

❯ time webpack                      
Hash: ebb00bbccd954c114d3c
Version: webpack 2.0.7-beta
Time: 3623ms

Restuta

Below is the list of modern JS frameworks and almost frameworks – React, Vue, Angular, Ember and others.

All files were downloaded from https://cdnjs.com and named accordingly. Output from ls command is stripped out (irrelevant stuff)

As-is (minified)

$ ls -lhS
566K Jan 4 22:03 angular2.min.js

addyosmani

CSS Layout Debugger

A tweet-sized debugger for visualizing your CSS layouts. Outlines every DOM element on your page a random (valid) CSS hex color.

One-line version to paste in your DevTools

Use $$ if your browser aliases it:

~ 108 byte version