Nodejs String Hash hashCode()

Method Source Code

String.prototype.hashCode = function(){
  var hash = 0;/*from   w w w.ja v  a 2  s  . c om*/
  for (var i = 0; i < this.length; i++) {
    var code = this.charCodeAt(i);
    hash = ((hash<<5)-hash)+code;
    hash = hash & hash; // Convert to 32bit integer
  }
  return hash;
}

Related

1. hash()

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

2. hash()

   String.prototype.hash = function () {
     var hash = 5381;
     for (var i = 0; i < this.length; i++) {
       var char = this.charCodeAt(i);
       hash = ((hash << 5) + hash) + char;
     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() {
     for(var ret = 0, i = 0, len = this.length; i < len; i++) {
       ret = (31 * ret + this.charCodeAt(i)) << 0;
     return ret;
   };
   

5. hashCode()

   String.prototype.hashCode = function() {
     for(var ret = 0, i = 0, len = this.length; i < len; i++) {
       ret = (31 * ret + this.charCodeAt(i)) << 0;
     return Math.abs(ret);
   };
   

6. hashCode()

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

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; 
     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;
   ...
   

9. hashCode()

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