socket.io/lib/util/array.js

// Methods from Array.js from MooTools (MIT)
// Copyright (c) 2006-2009 Valerio Proietti, <http://mad4milk.net/>

(function(){

  var array = io.util.Array = {
  
    include: function(arr, item){
      if (!array.contains(arr, item)) arr.push(item);
    	return arr;
    },
  
    each: function(arr, fn, bind){
    	for (var i = 0, l = arr.length; i < l; i++) fn.call(bind, arr[i], i, arr);
    },
  
    contains: function(arr, item, from){
    	return array.indexOf(arr, item, from) != -1;
    },
  
    indexOf: function(arr, item, from){
    	for (var l = arr.length, i = (from < 0) ? Math.max(0, l + from) : from || 0; i < l; i++){
    		if (arr[i] === item) return i;
    	}
    	return -1;
    }
  
  };

})();