Here you can find the source of endsWith(substr)
String.prototype.endsWith = function(substr) { return (this.match(substr + "$") == substr); };
String.prototype.endsWith = function(str) { if (str == this.substring(this.length - str.length, this.length)) return true; return false;
String.prototype.endsWith = function (string) { var index = arguments.length < 2 ? this.length : arguments[1]; return this.indexOf(string) === index - string.length; };
String.prototype.endsWith = function (string) { var index = arguments.length < 2 ? this.length : arguments[1]; return this.indexOf(string) === index - string.length; };
String.prototype.endsWith = function (string) { var index = arguments.length < 2 ? this.length : arguments[1]; var foundIndex = this.indexOf(string); return foundIndex !== -1 && foundIndex === index - string.length; };
String.prototype.endsWith = function (string) { var index = arguments.length < 2 ? this.length : arguments[1]; var foundIndex = this.lastIndexOf(string); return foundIndex !== -1 && foundIndex === index - string.length; };
String.prototype.endsWith = function (substring) { var stringCut = this.substring(this.length - substring.length); return stringCut === substring;
String.prototype.endsWith = function(substring) { var stringLength = this.length; var substringLength = substring.length; if (substringLength > stringLength) { return false; var i; for (i = 0; i < substringLength; i += 1) { if (substring[substringLength - i] !== this[stringLength - i]) { ...
String.prototype.endsWith = function(substring){ return this.lastIndexOf(substring) == this.length - substring.length; };
String.prototype.endsWith = function(substring) { var compareString = this.substring(this.length - substring.length, this.length); return compareString === substring; };