Here you can find the source of endsWith(suffix)
'use strict';// w w w .j av a 2 s. c o m String.prototype.endsWith = function(suffix) { return this.indexOf(suffix, this.length - suffix.length) !== -1; };
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; };
String.prototype.endsWith = function(suffix) { return this.indexOf(suffix, this.length - suffix.length) !== -1; };
String.prototype.endsWith = function(suffix) { return this.indexOf(suffix, this.length - suffix.length) !== -1; }; function endsWith (str, suffix) { return str.indexOf(suffix, str.length - suffix.length) !== -1;
"use strict"; String.prototype.endsWith = function(suffix) { if (!suffix) return false; return this.indexOf(suffix, this.length - suffix.length) !== -1; };
String.prototype.endsWith = function(suffix) { return this.match(suffix + '$') == suffix; };
String.prototype.endsWith = function(suffix) return (this.substr(this.length - suffix.length) === suffix);