define(['../lang/toString'], function(toString) {

    /**
     * Unescape unicode char sequences
     */
    function unescapeUnicode(str){
        str = toString(str);
        return str.replace(/\\u[0-9a-f]{4}/g, function(ch){
            var code = parseInt(ch.slice(2), 16);
            return String.fromCharCode(code);
        });
    }

    return unescapeUnicode;

});