Nodejs Utililty Methods String Capitalize

var log = function(log){
    console.log(log);
};
String.prototype.capitalizeFirstLetter = function() {
        return this.charAt(0).toUpperCase() + this.slice(1);
};

String.prototype.capitalizeFirstLetter = function() {
    return this.charAt(0).toUpperCase() + this.slice(1);
};
Array.prototype.randomElement = function () {
    return this[Math.floor(Math.random() * this.length)];
};

String.prototype.capitalizeFirstLetter = function(){
     return this[0].toUpperCase() + this.slice(1);

String.prototype.capitalizeFirstLetter = function() {
    return this.charAt(0).toUpperCase() + this.slice(1);
if (!String.prototype.format) {
  String.prototype.format = function() {
    var args = arguments;
    return this.replace(/{(\d+)}/g, function(match, number) { 
      return typeof args[number] != 'undefined'
        ? args[number]
...

String.prototype.capitalizeFirstLetter = function() {
    return this.charAt(0).toUpperCase() + this.slice(1);

String.prototype.capitalizeFirstLetter = function() {
    return this.charAt(0).toUpperCase() + this.slice(1);
};
function titleCase(str) {
    var lowerStr = str.toLowerCase();
    var strArray = lowerStr.split(" ");
    var capitalisedArray = [];
    for (var i = 0, len = strArray.length; i < len; i++) {
        capitalisedArray.push(strArray[i].capitalizeFirstLetter());
...

function myReplace(str, wordToReplace, newWord) {
    console.log(/[A-Z]/.test(wordToReplace[0]));
    if(/[A-Z]/.test(wordToReplace[0])) {
        newWord = newWord.capitalizeFirstLetter();
    if(/[a-z]/.test(wordToReplace[0])) {
        newWord = newWord.minusculeFirstLetter();
    str = str.replace(wordToReplace, newWord);
...

RegExp.escape = function(text) {
  return text.replace(/[-[\]{}()*+?.,\\^$|#\s]/g, '\\$&');
};
String.prototype.capitalizeFirstLetter = function() {
  return this.charAt(0).toUpperCase() + this.slice(1);
};

"use strict";
String.prototype.capitalizeFirstLetter = function () {
    return this.charAt(0).toUpperCase() + this.slice(1);
};

String.prototype.capitalizeFirstLetter = function() {
    return this.charAt(0).toUpperCase() + this.slice(1).toLowerCase();