Nodejs Utililty Methods Array Random

Array.prototype.random = function() {
  return this[ Math.randomInt( 0, this.length - 1 ) ];
};

Array.prototype.random = function () {
    return this[ (Math.random() * this.length).floor() ];
};

Array.prototype.random = function() {
  if (!this.length) { return null; }
  return this[Math.floor(ROT.RNG.getUniform() * this.length)];

Array.prototype.random = function(){
    return this[sb.math.rand(0,this.length)];
};

Array.prototype.random = function() { 
    return this[Math.floor(Math.random() * this.length)];
};

Array.prototype.random = function() { 
  return this[Math.rand(0, this.length)]; 

Array.prototype.random = Array.prototype.random || function() {
  if (!this.length) { return null; }
  return this[Math.floor(ROT.RNG.getUniform() * this.length)];

Array.prototype.random = function() {
    if (this.length === 0) {
        return null;
    if (this.length === 1) {
        return this[0];
    return this[Math.floor(RougeLib.RNG.random() * this.length)];
};
...

var colors = ["#FFBF00", "#0080FF","#01DF3A","#FF0080"]
Array.prototype.random = function(){
  return this[Math.floor(this.length * Math.random())]

"use strict";
var cyphers, letters;
exports.options = "-r, --replace";
exports.description = "Return a the current sentence, where the 'x' are replaced by random number, and the 'y'.";
letters = ["a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"];
cyphers = ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9"];
Array.prototype.random = function() {
  return this[~~(Math.random() * this.length)];
};
...