Nodejs Utililty Methods String Starts With

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

String.prototype.startsWith = function(prefix)
    return (this.substr(0, prefix.length) === prefix);

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

String.prototype.startsWith = function(prefix) {
  var i = this.indexOf(prefix);
  if (i == 0) {
    return true;
  return false;

String.prototype.startsWith = function (prefix) {
  "use strict";
  if (!prefix && typeof prefix !== 'string') {
    return false;
  return this.indexOf(prefix) === 0;
};

String.prototype.startsWith = function(prefix){
    return !this.indexOf(prefix);
};
(function(){
    window.onload = function(){
        return;
        var as = document.getElementsByTagName("a");
        for(var i=0,l=as.length; i<l; i++){
            var a=as[i], href=a.getAttribute("href") || a.href;
...

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

String.prototype.startsWith = function (prefix){
    return this.slice(0, prefix.length) === prefix;
};

String.prototype.startsWith = String.prototype.startsWith || function (prefix){
    return this.slice(0, prefix.length) === prefix;
};

String.prototype.startsWith = function (prefix) {
  return this.substring(0, prefix.length) === prefix;
};