Here you can find the source of endsWith(text)
String.prototype.endsWith = function (text) { return this.substring(this.length - text.length) === text; };
String.prototype.endsWith = function(suffix) { return this.slice(-suffix.length) == suffix;
String.prototype.endsWith = function(suffix) { return this.indexOf(suffix, this.length - suffix.length) !== -1; };
String.prototype.endsWith = function (suffix) { return this.substring(this.length - suffix.length) == suffix; };
String.prototype.endsWith = function(t, i) { if (i == false) { return (t == this.substring(this.length - t.length)); } else { return (t.toLowerCase() == this.substring(this.length - t.length).toLowerCase()); };
String.prototype.endsWith = function(test) { return this.length >= test.length && this.substr(this.length - test.length) == test;
String.prototype.endsWith = function(text) { return text != null && this.lastIndexOf(text) == this.length - text.length; };
String.prototype.endsWith = function(value) { if (!value) return false; if (value.length > this.length) return false; var end = this.substring(this.length - value.length); return end === value; };
String.prototype.endsWith = function (value) { if (value == undefined || typeof (value) != "string" || value.length > this.length) return false; if (value.length == 0) return true; return this.substr(this.length - value.length) == value; };
String.prototype.endsWith = function(value) { if (this.length < value.length) { return false; } else { return Boolean(this.substr((this.length - value.length), (value.length + 1)) === value);