JavaScript - Why can't I add new attributes to a “string” object?

Question

I\'ve experimented with JavaScript and noticed this strange thing:

var s = \"hello world!\";
s.x = 5;
console.log(s.x); //undefined

Every t

Answer 1

Try to do this:

var s = "hello world!";
s.prototype.x = 5;
console.log(s.x);