Here you can find the source of endsWith(str)
String.prototype.endsWith = function(str){ return this.slice(-str.length) == str }
String.prototype.endsWith = function(str) { if (this.length - this.indexOf(str) === str.length) { return true; }else { return false; };
String.prototype.endsWith = function(str) var lastIndex = this.lastIndexOf(str); return (lastIndex != -1) && (lastIndex + str.length == this.length);
String.prototype.endsWith = function(str) return this.indexOf(str, this.length - str.length) !== -1; }; String.prototype.startsWith = function (str){ return this.indexOf(str) == 0; };
String.prototype.endsWith = function(str) { return (this.match(str + "$") == str);
String.prototype.endsWith = function (str){ return this.slice(-str.length) === str; };
String.prototype.endsWith = function(str) { return (this.match(str + '$') == str);
String.prototype.endsWith = function(str) {return (this.match(str+"$")==str)} String.prototype.startsWith = function(str) {return (this.match("^"+str)==str)} var myStr = "Earth is a beautiful planet"; if (myStr.startsWith("Earth")) { console.log("TRUE"); else { ...
String.prototype.endsWith = function(str) { var len = str.length; if (len > this.length) { return false; } return this.substring(this.length-len) === str; };
String.prototype.endsWith = function(str){ return (this.toString().substr(-str.length) == str); };