Nodejs String Hash hashCode()

Method Source Code

/**/* ww w . java2  s .c o m*/
 * This function is copy & pasted from this answer:
 *
 * http://stackoverflow.com/a/15710692/3036625
 */
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();
};

Related

1. 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 >>> 0);
   ...
   

2. 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;
           hash |= 0; 
       return hash;
   };
   

3. hashCode()

   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;
   ...
   

4. 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);
   ...
   

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;
     return hash
   ...
   

7. 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;
   };
   

8. 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();
   ...
   

9. 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); 
   ...