Nodejs String Hash hashCode()

Method Source Code

var crypto = require('crypto');

function hashString(str) {
  return crypto.createHash('md5').update(str || '').digest('hex');
}

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);//from  w w  w .j  a  v  a2  s  .c o m
    hash  = ((hash << 5) - hash) + chr;
    hash |= 0; // Convert to 32bit integer
  }
  return hash;
};

module.exports = hashString;

Related

1. hashCode()

   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();
   ...
   

2. 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
   ...
   

3. hashCode()

   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;
   };
   

4. 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 & hash; 
       return hash.toString();
   ...
   

5. hashCode()

   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 Math.abs(hash); 
   ...
   

6. hashCode()

   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;
   ...
   

7. hashCode()

   String.prototype.hashCode = function(){
       var hash = 0;
       if (this.length === 0) return hash;
       if (Array.prototype.reduce){
         hash = this.split("").reduce(function(a,b){a=((a<<5)-a)+b.charCodeAt(0);return a&a},0); 
       else 
       for (var i = 0; i < this.length; i++) {
           hash  = ((hash<<5)-hash) + this.charCodeAt(i);
   ...
   

8. hashCode()

   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;
   ...
   

9. hashCode()

   '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;
   ...