Aarón García Hervás aarongarciah

What forces layout / reflow

All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.

Generally, all APIs that synchronously provide layout metrics will trigger forced reflow / layout. Read on for additional cases and details.

Element APIs

Getting box metrics

elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent

10 JavaScript Terms You Should Know

From currying to closures there are quite a number of special words used in JavaScript. These will not only help you increase your vocabulary but also better understand JavaScript. Special terms are normally found in documentation and technical articles. But some of them like closures are pretty standard things to know about. Knowing what the word itself means can help you know the concept it's named for better.

Arity
Anonymous
Closure
Currying
Hoisting
Mutation

Better using Crontab

Here are a few tips to get more out of Cron:

Test your scripts using Cron limited environment
Have it send you report to another email than root@locahost
Make it use another shell.

# Cron only provides a limited environment.
# To simulate it to test run your scripts

Speed is a feature: 10 tips for faster browser networking

1. Minimize TCP connections

Ensure the web server uses Keep-Alive headers.

2. Reduce DNS look-ups

DNS look-ups are the first thing blocking your HTTP requests.

`vs` Questions

http://stackoverflow.com/questions/804115 (rebase vs merge).
https://www.atlassian.com/git/tutorials/merging-vs-rebasing (rebase vs merge)
https://www.atlassian.com/git/tutorials/undoing-changes/ (reset vs checkout vs revert)
http://stackoverflow.com/questions/2221658 (HEAD^ vs HEAD~) (See git rev-parse)
http://stackoverflow.com/questions/292357 (pull vs fetch)
http://stackoverflow.com/questions/39651 (stash vs branch)
http://stackoverflow.com/questions/8358035 (reset vs checkout vs revert)

This content moved here: https://exploringjs.com/impatient-js/ch_arrays.html#quickref-arrays

The Rules of React

All libraries have subtle rules that you have to follow for them to work well. Often these are implied and undocumented rules that you have to learn as you go. This is an attempt to document the rules of React renders. Ideally a type system could enforce it.

What Functions Are "Pure"?

A number of methods in React are assumed to be "pure".

On classes that's the constructor, getDerivedStateFromProps, shouldComponentUpdate and render.

	// Background mixin
	@mixin strips($color, $angle){
	$color: saturate(lighten($color, 2%), 10%);
	background: $color
	linear-gradient($angle, $color 0%, $color 10%,
	mix(black, $color, 5%) 10%, mix(black, $color, 5%) 20%,
	mix(black, $color, 12%) 19%, mix(black, $color, 10%) 21%, // Thin line between gradient
	mix(black, $color, 10%) 20%, mix(black, $color, 10%) 30%,
	mix(black, $color, 17%) 29%, mix(black, $color, 15%) 31%, // Thin line between gradient
	mix(black, $color, 15%) 30%, mix(black, $color, 15%) 40%,

 const addCounter = (list) => {
   return [...list, 0];
 };
 const removeCounter = (list, index) => {\
   return [
     ...list.slice(0, index),
     ...list.slice(index + 1)
   ];
 };

	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);