Nodejs Utililty Methods String Hash

String.prototype.hashCode = function() {
  var hash = 0, i, chr, len;
  if (this.length === 0) return hash;
  for (i = 0, len = this.length; i < len; i++) {
    chr   = this.charCodeAt(i);
    hash  = ((hash << 5) - hash) + chr;
    hash |= 0; 
  return hash;
...

String.prototype.hashCode = function() {
  var hash = 0, i, chr, len;
  if (this.length === 0) return hash;
  for (i = 0, len = this.length; i < len; i++) {
    chr   = this.charCodeAt(i);
    hash  = ((hash << 5) - hash) + chr;
    hash |= 0; 
  return (hash >>> 0);
...

"use strict";
String.prototype.hashCode = function() {
    var hash = 0, i, chr, len;
    if (this.length == 0) return hash;
    for (i = 0, len = this.length; i < len; i++) {
        chr   = this.charCodeAt(i);
        hash  = ((hash << 5) - hash) + chr;
        hash |= 0; 
    return hash;
};

String.prototype.hashCode = function(){
    var hash = 0, i, char;
    if (this.length == 0) return hash;
    for (i = 0, l = this.length; i < l; i++) {
        char  = this.charCodeAt(i);
        hash  = ((hash << 5) - hash) + char;
        hash |= 0; 
    return hash;
...

"use strict";
String.prototype.hashCode = function () {
  var hash = 0,
      i,
      chr,
      len;
  if (this.length === 0) return hash;
  for (i = 0, len = this.length; i < len; i++) {
    chr = this.charCodeAt(i);
...

String.prototype.hashCode = function() {
  var hash = 0, i, chr, len;
  if (this.length == 0) return hash;
  for (i = 0, len = this.length; i < len; i++) {
    chr   = this.charCodeAt(i);
    hash  = ((hash << 5) - hash) + chr;
    hash |= 0; 
  return hash;
...

String.prototype.hashCode = function () {
    if (this.length == 0) return 0;
    return this.split("").reduce(function (a, b) {
        a = ((a << 5) - a) + b.charCodeAt(0);
        return a & a
    }, 0);
};
JSON.hashCode = function (obj) {
    return JSON.stringify(obj).hashCode();
...

String.prototype.hashCode = function(){
  var hash = 0;
  if(this.length == 0) return hash;
  for(i = 0; i < this.length; i++){
    char = this.charCodeAt(i);
    hash = ((hash<<5)-hash)+char;
    hash &= hash;
  return hash
...

String.prototype.hashCode = function() {
  var hash = 0,
    i, chr, len;
  if (this.length === 0) return hash;
  for (i = 0, len = this.length; i < len; i++) {
    chr = this.charCodeAt(i);
    hash = ((hash << 5) - hash) + chr;
    hash |= 0;
  return hash;
};

String.prototype.hashCode = function () {
    var hash = 0;
    if (this.length == 0) return hash;
    for (i = 0; i < this.length; i++) {
        char = this.charCodeAt(i);
        hash = ((hash << 5) - hash) + char;
        hash = hash & hash; 
    return hash.toString();
...