Here you can find the source of contains(element)
//javascript the good parts taught me this! Array.prototype.contains = function (element) {/* w ww.j a v a 2s . c o m*/ 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) { for (i in this) 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; };
Array.prototype.contains = function(element) { var i = this.length; while(i--) { if (_.isEqual(this[i], element)) { return true; return false;
Array.prototype.contains = function(element) { return this.indexOf(element) != -1; }; Object.prototype.toString = function() { try { return JSON.stringify(this); } catch(circular_structure) { return '[object Object]'; };
'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))