define(['../lang/toString', './WHITE_SPACES'], function(toString, WHITE_SPACES){
    /**
     * Remove chars from beginning of string.
     */
    function ltrim(str, chars) {
        str = toString(str);
        chars = chars || WHITE_SPACES;

        var start = 0,
            len = str.length,
            charLen = chars.length,
            found = true,
            i, c;

        while (found && start < len) {
            found = false;
            i = -1;
            c = str.charAt(start);

            while (++i < charLen) {
                if (c === chars[i]) {
                    found = true;
                    start++;
                    break;
                }
            }
        }

        return (start >= len) ? '' : str.substr(start, len);
    }

    return ltrim;
});