Nodejs Utililty Methods String Starts With

String.prototype.startsWith = function(substr) {
    for (var i = 0; i < substr.length; i++) {
        if (this[i] !== substr[i]) {
            return false;
    return true;

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

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

"use strict";
String.prototype.startsWith  = function(substring) {
    var substringLength = substring.length;
    if (substringLength > this.length) {
        return false;
    var i;
    for (i = 0; i < substringLength; i += 1) {
        if (substring[i] !== this[i]) {
...

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

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

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

console.log(typeof Array.prototype.sort);          
console.log(typeof String.prototype.substring);    
String.prototype.startsWith = function (text) {
  return this.indexOf(text) === 0;
};
var msg = 'Hello world!';
console.log(msg.startsWith('Hello'));  

String.prototype.startsWith = function (text) {
    return this.indexOf(text) == 0;
};
var msg = "Hello world!";
print(msg.startsWith("Hello"));   

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