adrianseeley

// based on http://msdn.microsoft.com/en-us/magazine/hh335067.aspx
// usage example at bottom

function pso (number_of_dimensions, function_to_optimize, number_of_particles, number_of_iterations, fitness_threshold, inertia_weight, cognitive_weight, social_weight) {
	var particles           = [];
	var swarm_best_position = [];
	var swarm_best_fitness  = null;
	for (var p = 0; p < number_of_particles; p++) {
		particles.push({
			particle_position:      [],

CrossEye

function lens(get, set) {
  var f = function (a) { return get(a); };
  f.set = set;
  f.mod = function (f, a) { return set(a, f(get(a))); };
  return f;
}

var first = lens(
  function (a) { return a[0]; },
  function (a, b) { return [b].concat(a.slice(1)); }

staltz

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

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This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

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oPorks

/**
 * Variant of Avraham Plotnitzky's String.prototype method mixed with the "fast" version
 * see: https://sites.google.com/site/abapexamples/javascript/luhn-validation
 * @author ShirtlessKirk. Copyright (c) 2012.
 * Licensed under WTFPL (http://www.wtfpl.net/txt/copying)
 */

function luhnChk(luhn) {
    var len = luhn.length,
        mul = 0,