Here you can find the source of contains(item)
// Returns true if the given item is contained in the array. Array.prototype.contains = function (item) { for (var i = 0; i < this.length; i++) { if (this[i] == item) return true; }//from w w w .j av a 2 s.c o m return false; };
Array.prototype.contains = function(item) { if (typeof(item) === 'function') { return this.some(item); return this.indexOf(item) >= 0; };
Array.prototype.contains = function(item) { return this.indexOf(item) === -1 ? false : true
Array.prototype.contains = function (item) { for (i in this) { if (this[i] === item) { return true; return false; };
Array.prototype.contains = function (item) { for (var i=0; i<this.length; ++i) if (this[i] == item) return true; return false; };
Array.prototype.contains = function(item){ for(i=0;i<this.length;i++){ if(this[i]==item){return true;} return false; };
Array.prototype.contains = function(item) return this.indexOf(item) != -1; };
Array.prototype.contains = function(item){ var contains = false; for (var i=0; i<this.length; i++){ if (this[i] === item){ contains = true; break; return contains; ...
Array.prototype.contains = function (item, from) { return this.indexOf(item, from) !== -1; };
Array.prototype.contains = function(item, from){ return this.indexOf(item, from) != -1;