Nodejs Utililty Methods String Starts With

String.prototype.startsWith = function (str){
    return this.indexOf(str) == 0;
};

String.prototype.startsWith = function(str) {
  return (this.match("^"+str)==str);
String.prototype.endsWith = function(str)  {
  return (this.match(str+"$")==str);

String.prototype.startsWith = function(str){
    return (this.indexOf(str) === 0);

String.prototype.startsWith = String.prototype.startsWith || function(str){
   return this.substr(0,str.length) === str
};
String.prototype.contains   = String.prototype.contains   || function(str){
  return this.indexOf(str) >= 0
};

String.prototype.startsWith = function(str) {
  return (this.match("^"+str)==str);
};

String.prototype.startsWith = function (str) {
  return this.indexOf(str) === 0;
};

String.prototype.startsWith = function(str){
  return this.slice(0, str.length) == str

String.prototype.startsWith = function(str) {
    if (typeof str !== 'string') return false;
    return this.indexOf(str) === 0;
};

String.prototype.startsWith = function (str) {
    "use strict";
    return (this.match("^" + str) == str);
};

String.prototype.startsWith = function(str)
{return (this.match("^"+str)==str)}
String.prototype.endsWith = function(str)
{return (this.match(str+"$")==str)}
var myStr = "Earth is a beautiful planet";
if (myStr.startsWith("Earth")) { 
  console.log("TRUE");
else {
...