Here you can find the source of contains(element)
Array.prototype.contains = function(element) { // the in operator does not work as expected for some reason ... for(var i = 0; i < this.length; i ++) if(this[i] === element) return true; return false; };
Array.prototype.contains = function (element) for (var i = 0; i < this.length; i++) if (this[i] == element) return true; return false; };
'use strict'; Array.prototype.contains = function (element) { return (this.indexOf(element) !== -1); };
Array.prototype.contains = function(element) { return this.indexOf(element) != -1; };
Array.prototype.contains = function(element) { return this.indexOf(element) != -1; };
Array.prototype.contains = function(element) { return (-1 !== this.indexOf(element))
Array.prototype.contains = function(element) for (var i = 0; i < this.length; i++) if (this[i] == element) return true; return false; };
Array.prototype.contains = function (element) { for (var i = 0; i < this.length; i++) { if (this[i] == element) { return true; };
Array.prototype.contains = function(element) { return (arrValues.indexOf(element) > -1);
Array.prototype.contains = function(element) { if(!element) return false; for (var e in this) { var arrayElement = this[e]; if(element == arrayElement) { return true; ...