In Javascript a dictionary comprehension, or an Object `map`

Question

I need to generate a couple of objects from lists in Javascript. In Python, I\'d write this:

{key_maker(x): val_maker(x) for x in a_list}

A

Answer 1

A shorter ES6 version would be:

a_list.reduce((obj, x) => (key_maker(obj[x]) = val_maker(x), obj),{})