How to use underscore's “intersection” on objects?

Question

_.intersection([], [])

only works with primitive types, right?

It doesn\'t work with objects. How can I make it work with objects (maybe b

Answer 1

Technically, it does work on objects, but you need to be careful of reference equality.

var jake = {'id': 1, 'name': 'jake' },
    jenny = {'id':4, 'name': 'jenny'},
    nick =  {'id': 9, 'name': 'nick'};
var a = [jake, jenny]
var b = [jake, nick];

_.intersection(a, b);
// is
[jake]