You cast the result to string anyway, isn't using modulo (6 times) more expensive in this case?

If they even reach your code...

[eval]:35
 else x=randint(0,10**randint(1,9));
                              ^
SyntaxError: Unexpected token (
    at Object. ([eval]-wrapper:6:22)
    at 
    at evalScript (node.js:536:25)
    at startup (node.js:80:7)
    at node.js:906:3

Another problem with not returning this arises, when you try to check whether your created object is an instance of NameMe or not.

var person = new NameMe('John', 'Doe');
person instanceof NameMe; // false, if you return a new object, which this solution does.

:)

The Python version of this kata doesn't provide any code. That makes the instruction "In this Kata you should try to fix all the syntax errors found in the code." very confusing.

Isn't the note "For example n % 0 = NaN, your method should return null." wrong then?