Nodejs String Hash hashCode()

Method Source Code

/*//ww  w  .  ja v a2 s .c o m
 * Extend String prototype with hashCode function known from Java
 */
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; // Convert to 32bit integer
    }
    return hash;
}

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;
   ...
   

2. hashCode()

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

7. 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;
   ...
   

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()

   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; 
   ...