bloodyowl

// ES6 tl;dr; for beginners
 
// 1. variables
 
// `const` & `let` are scoped at the block level
if(true) {
  let foo = "bar"
}
foo // ReferenceError
 

bendc

// array utils
// =================================================================================================

const combine = (...arrays) => [].concat(...arrays);

const compact = arr => arr.filter(Boolean);

const contains = (() => Array.prototype.includes
  ? (arr, value) => arr.includes(value)
  : (arr, value) => arr.some(el => el === value)

nfroidure

var Promise=(function() {
	var AWAIT=0, SUCCESS=1, FAIL=-1;
	function Promise(logic) {
		var promise=this;
		promise.solved=AWAIT;
		var success=function (value) {
			if(AWAIT!==promise.solved)
				return;
			promise.solved=SUCCESS;
			promise.value=value;

eirikbacker

//addEventListener polyfill 1.0 / Eirik Backer / MIT Licence
(function(win, doc){
	if(win.addEventListener)return;		//No need to polyfill

	function docHijack(p){var old = doc[p];doc[p] = function(v){return addListen(old(v))}}
	function addEvent(on, fn, self){
		return (self = this).attachEvent('on' + on, function(e){
			var e = e || win.event;
			e.preventDefault  = e.preventDefault  || function(){e.returnValue = false}
			e.stopPropagation = e.stopPropagation || function(){e.cancelBubble = true}