hash: String.hashCode(), djb2, sdbm, lose lose

/* Java String.hashCode() */
hashCode = function(str){
    var hash = 0;
    if (str.length == 0) return hash;
    for (i = 0; i < str.length; i++) {
        char = str.charCodeAt(i);
        hash = ((hash<<5)-hash)+char;
        hash = hash & hash; // Convert to 32bit integer
    }
    return hash>>>0;
}

/* djb2 */
djb2Code = function(str){
    var hash = 5381;
    for (i = 0; i < str.length; i++) {
        char = str.charCodeAt(i);
        hash = ((hash << 5) + hash) + char; /* hash * 33 + c */
    }
    return hash>>>0;;
}


/* sdbm */
sdbmCode = function(str){
    var hash = 0;
    for (i = 0; i < str.length; i++) {
        char = str.charCodeAt(i);
        hash = char + (hash << 6) + (hash << 16) - hash;
    }
    return hash>>>0;
}

/* lose lose */
loseCode = function(str){
    var hash = 0;
    for (i = 0; i < str.length; i++) {
        char = str.charCodeAt(i);
        hash += char;
    }
    return hash;
}

/* sdbm prototype */
String.prototype.sdbmCode = function(){
        var hash = 0;
        var tempChar;
    for (var i = 0; i < this.length; i++) {
        tempChar = this.charCodeAt(i);
        hash = tempChar + (hash << 6) + (hash << 16) - hash;
    }
    return hash>>>0;
};