Fintan Fintan

This example choropleth encodes road deaths in the Republic of Ireland in 2010. The data is taken from the Irish Road Safety Authority. Irish geoJSON data based on https://gist.github.com/2183412. Colours by Colorbrewer.

Collections

each(array)

Underscore example:

_.each([1, 2, 3], function(num) { alert(num); });

What's wrong with Netmag's "Optimize your JavaScript" post

Update: The original post on Netmag has been updated since this was written.

I tweeted earlier that this should be retracted. Generally, these performance-related articles are essentially little more than linkbait -- there are perhaps an infinite number of things you should do to improve a page's performance before worrying about the purported perf hit of multiplication vs. division -- but this post went further than most in this genre: it offered patently inaccurate and misleading advice.

Here are a few examples, assembled by some people who actually know what they're talking about (largely Rick Waldron and Ben Alman, with some help from myself and several others from the place that shall be unnamed).

	13:15 <xQuasar> \| HASKELL IS FOR FUCKIN FAGGOTS. YOU'RE ALL A BUNCH OF
	\| FUCKIN PUSSIES
	13:15 <xQuasar> \| JAVASCRIPT FOR LIFE FAGS
	13:16 <luite> \| hello
	13:16 <ChongLi> \| somebody has a mental illness!
	13:16 <merijn> \| Wow...I suddenly see the error of my ways and feel
	\| compelled to write Node.js!
	13:16 <genisage> \| hi
	13:16 <luite> \| you might be pleased to learn that you can compile
	\| haskell to javascript now

	Model = function(){
	this.events = $({});
	this.attributes = {};
	};

	Model.prototype.set = function( key, value ){
	var self = this;
	var events = [];

	var cached_attributes = _.extend( {}, this.attributes );

	<!DOCTYPE html>
	<html>
	<head>
	<script src="http://code.jquery.com/jquery.min.js"></script>
	<link href="http://twitter.github.com/bootstrap/assets/css/bootstrap.css" rel="stylesheet" type="text/css" />
	<script src="http://twitter.github.com/bootstrap/assets/js/bootstrap.js"></script>
	<meta charset=utf-8 />
	</head>
	<body>

	.PHONY: compile

	time=/usr/bin/time

	compile: dart typescript coffeescript haxe jsx

	dart:
	$(time) dart2js -ooutput/dart.js source/simple.dart

	typescript:

	import haxe.macro.Expr;

	class Main {
	static function main() {
	var a = generateCharCodeArray("foobar");
	trace(a); // [102,111,111,98,97,114]
	}

	#if haxe_211
	@:macro static public function generateCharCodeArray(source:String) {

	_.mixin({

	// Get/set the value of a nested property
	deep: function (obj, key, value) {

	var keys = key.replace(/\[(["']?)([^\1]+?)\1?\]/g, '.$2').replace(/^\./, '').split('.'),
	root,
	i = 0,
	n = keys.length;

Fintan Fintan

Collections

each(array)

What's wrong with Netmag's "Optimize your JavaScript" post

Things that are just plain wrong