Extend a String class in ES6

Question

I can write the following in ES5:

String.prototype.something=function(){
  return this.split(\' \').join(\'\');
};

How do I do the same thi

Answer 1

Your proposal works fine in ES6, is there something wrong with it?

If you want to actually extend String, instead of just adding a method to String itself, and get that warm ES6 feeling, you could try:

class MyString extends String {
    something() { return this.split(' ').join(''); }
}

However, you are going to quickly run into limitations on extending built-in classes. Chances are you will see the dreaded

TypeError: String.prototype.toString is not generic

error message (this is from babel-node).