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

Giorgi Kandelaki gave a good answer, but it had some potential problems (see my comment on his answer).

The correct way is:

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

or

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