Difference between ES6 object method assignment: a, 'a', and ['a']?

Question

With ES6, I can create a new object with functions like the following:

var obj = {
    something() {}
};

That makes sense. But I can also d

Answer 1

First and second are the same, and do the same as

obj.something = function something() {}

the third one creates an anonymous function and stores it in obj.something. It's an equivalent to this:

obj['something'] = function() {}

Quotes allow to create keys (and hence function names) that are not valid identifiers in JS, for example:

 var obj = {
    '123'() {}
};

creates a function with the name 123, believe it or not.

The square brackets syntax allows arbitrary expressions, so you can do

 var obj = {
   ['myfunc_' + getFuncName()] () {}
 }

and similar cool things.