Nodejs String Hash hashCode()

Method Source Code

/**/*from   w  ww.  j  ava2  s  .  c o  m*/
 * Created by MetaSean on 20150622.
 */

   // hashCode is strongly based on
   // http://werxltd.com/wp/2010/05/13/javascript-implementation-of-javas-string-hashcode-method/
String.prototype.hashCode = function(){
   var hash = 0;
   if (this.length === 0) return hash;
   for (i = 0; i < this.length; i++) {
      chr = (this.charCodeAt(i) * 2.2); // `* 2.2` increases entropy
      hash = ((hash<<32)-hash)+chr; // was previously `hash = ((hash<<5)-hash)+chr;`
      hash = hash & hash; // Convert to 32bit integer
   }
   return hash;
};

Related

1. hashCode()

   String.prototype.hashCode = function(){
       var hash = 0, i, char;
       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;
   ...
   

2. 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;
   ...
   

3. 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; 
   ...
   

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;
   ...
   

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 hash;
   ...
   

6. 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;
   ...
   

7. 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; 
   ...
   

8. hashCode()

   var Commons = function() {};
   String.prototype.hashCode = function() {
       var aux = "v1.0" + this;
       var hash = 0, i, chr, len;
       if (this.length === 0) return hash;
       for (i = 0, len = aux.length; i < len; i++) {
           chr   = aux.charCodeAt(i);
           hash  = ((hash << 5) - hash) + chr;
           hash |= 0; 
   ...
   

9. hashCode(s)

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