Get object keys for filtered values

Question

The case is simple - I\'ve got a following object:

Object {1: false, 2: true, 3: false, 4: false, 5: false, 6: false, 7: false, 8: true, 12: false, 13: false, 14         


        

Answer 1

You can try this:

_.pairs(obj)
 .filter(function(pair) { return pair[1] })
 .map(function(pair) { return pair[0] })

Or the same but bit more concise:

_.pairs(obj).filter(_.last).map(_.first)