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