Nodejs String Hash getHashCode()

Method Source Code

String.prototype.getHashCode = 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);//w  ww.  j a  v a  2 s.co  m
        hash  = ((hash << 5) - hash) + chr;
        hash |= 0; // Convert to 32bit integer
    }
    return hash;
};

Related

1. GetHashCode()

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

2. getHashCode()

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

3. getHashCode()

   String.prototype.getHashCode = 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;
   ...
   

4. getHashCode(caseSensitive)

   String.prototype.getHashCode = function (caseSensitive) {
       var str = this;
       if (!caseSensitive) {
           str = str.toLowerCase();
       var hash = 1315423911, i, ch;
       for (i = str.length - 1; i >= 0; i--) {
           ch = str.charCodeAt(i);
           hash ^= ((hash << 5) + ch + (hash >> 2));
   ...
   

5. 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;
   };
   ...
   

6. 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;
   };