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// Support routines for automatically reporting user timing for common analytics platforms
// Currently supports Google Analytics, Boomerang and SOASTA mPulse
// In the case of boomerang, you will need to map the event names you want reported
// to timer names (for mPulse these need to be custom0, custom1, etc) using a global variable:
// rumMapping = {'aft': 'custom0'};
(function() {
var wtt = function(n, t, b) {
  t = Math.round(t);
  if (t >= 0 && t < 3600000) {
    // Google Analytics

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<?xml version="1.0" encoding="utf-8"?>
<project name="sample-require-js" default="" basedir=".">
    
    <!-- properties -->
    
    <property name="r.js" value="_build/rjs/r.js" />
    <property name="closure.jar" value="_build/closure/compiler.jar" />
    <property name="rhino.jar" value="_build/rhino/js.jar" />
    <property name="js.build" value="_build/js.build.js" />
    <property name="css.build" value="_build/css.build.js" />

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/**
 * Performs a binary search on the host array. This method can either be
 * injected into Array.prototype or called with a specified scope like this:
 * binaryIndexOf.call(someArray, searchElement);
 *
 * @param {*} searchElement The item to search for within the array.
 * @return {Number} The index of the element which defaults to -1 when not found.
 */
function binaryIndexOf(searchElement) {
	'use strict';

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<?xml version="1.0" encoding="utf-8"?>
<project name="sample-require-js" default="" basedir=".">
    
    <!-- properties -->
    
    <property name="r.js" value="_build/rjs/r.js" />
    <property name="closure.jar" value="_build/closure/compiler.jar" />
    <property name="rhino.jar" value="_build/rhino/js.jar" />
    <property name="js.build" value="_build/js.build.js" />
    <property name="css.build" value="_build/css.build.js" />

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Essential JavaScript Links

A curated list by Eric Elliott and friends. Suggest links in the gist comments.

Help us turn this into a proper website!

This is a very exclusive collection of only must-have JavaScript links. I'm only listing my favorite links. Nothing else makes the cut. Feel free to suggest links if you think they're good enough to make this list. The really curious should feel free to browse the comments to find other links. I can't guarantee the quality of links in the comments.

Full Disclosure

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var foo = true;

if (foo) {
  let bar = foo * 2;
  bar = something(bar);
  console.log(bar);
}

console.log(bar); // ReferenceError

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(function () {
	var perfBar = function(budget) {

		window.onload = function() {
			window.performance = window.performance || window.mozPerformance || window.msPerformance || window.webkitPerformance || {};


			var timing = window.performance.timing,
			now = new Date().getTime(),
			output, loadTime;

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// Promise.all is good for executing many promises at once
Promise.all([
  promise1,
  promise2
]);

// Promise.resolve is good for wrapping synchronous code
Promise.resolve().then(function () {
  if (somethingIsNotRight()) {
    throw new Error("I will be rejected asynchronously!");

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function countCSSRules() {
    var results = '',
        log = '';
    if (!document.styleSheets) {
        return;
    }
    for (var i = 0; i < document.styleSheets.length; i++) {
        countSheet(document.styleSheets[i]);
    }
    function countSheet(sheet) {

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// This event emitter emits events, but reserves the right to publish events to
// for its creator. It uses a WeakMap for true encapsulation.

const eesToEventMaps = new WeakMap();

export default class EventEmitter {
    constructor(publisher) {
        const eventMap = Object.create(null);
        eesToEventMaps.set(this, eventMap);