Could you use Javascript objects as keys to another object?

No, you can’t. I’ve got an example for you:

var a={},
    b={key:'b'},
    c={key:'c'};a[b]=123;
a[c]=456;console.log(a[b]);
console.log(a[c]);

Variable declaration and hoisting

Javascript Baseline pt. 1

First steps into Data Science

Story about inferential statistics project