Why doesn't Object.keys(window) or for(k in window) return Math?

Question

I am building a javascript editor autocomplete, and I would like to list all top-level things that are available. I tried:

Object.keys(window)

and

for (k in window) 

but it doesn't look like either is returning things like 'Math' or 'Array'. How can I get everything from window?

Answer 1

Object.getOwnPropertyNames() contains Math, Array, ... etc.

check this question : Object.getOwnPropertyNames vs Object.keys