Converts a String to a 32bit integer

stringtoInteger.js

    String.prototype.hashCode = function () {
      var hash = 0, i, chr;
      if (this.length === 0) return hash;
      for (i = 0; i < this.length; i++) {
        chr = this.charCodeAt(i);
        hash = ((hash << 5) - hash) + chr;
        hash |= 0; // Convert to 32bit integer
      }
      return hash;
    };

    // Use
    var str = "Hello World";
    console.log(str.hashCode());