Nodejs Utililty Methods Base64 Encode

String.prototype.toBase64 = (function(){
  var b64chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
  var b64hash = {}; b64chars.split('').forEach(function(v,i){b64hash[v]=i});
  var b64pos = [18, 12, 6, 0];
  var b64and = b64pos.map(function(v){return 63<<v});
  return function toBase64 () {
    var length = this.length;
    var count, encoded = [], b64string = "";
    var i, extra;
...

String.prototype.toBase64 = function () {
    var converter = new Buffer(this.toString(), 'utf8');
    return converter.toString('base64');

const CODES = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/='
String.prototype.toBase64 = function() {
  let out = ''
  for (let i = 0, length = this.length; i < length; i += 3) {
    let [a, b, c] = [...this.slice(i, i + 3)].map(c => c.charCodeAt(0))
    bits = a << 16 | b << 8 | c
    out += CODES[bits >> 18 & 0x3F]
    out += CODES[bits >> 12 & 0x3F]
    out += b ? CODES[bits >> 6 & 0x3F] : '='
...

String.prototype.toBase64 = function() {
  var keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="
  var output = ""
  var chr1, chr2, chr3
  var enc1, enc2, enc3, enc4
   var i = 0
   do {
      chr1 = this.charCodeAt(i++)
      chr2 = this.charCodeAt(i++)
...

String.prototype.toBase64 = function(){
  var nToOrd = function(n){
    return n < 26 ? "A".charCodeAt(0) + n : (
      n < 52 ? "a".charCodeAt(0) - 26 + n : (
        n < 62 ? "0".charCodeAt(0) - 52 + n : (
          n==62 ? "+".charCodeAt(0) : "/".charCodeAt(0)
        )
      )
    );
...

var code = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'.split('');
String.prototype.toBase64 = function() {
  var encoded = [];
  var a, b, c;
  for (var i = 0, len = this.length; i < len; i = i + 3) {
    a = this.charCodeAt(i);
    encoded.push(code[a >> 2]);
    b = this.charCodeAt(i + 1);
    if (isNaN(b)) {
...

String.prototype.toBase64 = function() {
  var chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
  var encoded = '';
  for(var i=0; i < this.length; i+=3) {
    var c1 = this.charCodeAt(i),
        c2 = this.charCodeAt(i+1),
        c3 = this.charCodeAt(i+2);
    encoded += chars[(c1 & 0xFC) >> 2];
    encoded += chars[((c1 & 0x03) << 4) | ((c2 & 0xF0) >> 4)];
...

String.prototype.toBase64 = function () {
  var stringyBits = this.match(/.{1,3}/g);
  var alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".split("");
  result = stringyBits.map(function(threeLetters) {
   var letters = threeLetters.split("");
    var ascii3 = letters.map(function(char) {
      return pad(char.charCodeAt(0).toString(2),8);
    });
    var twentyFour3 = ascii3[0]+ascii3[1]+ascii3[2];
...