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

var keys = [];
_.each( obj, function( val, key ) {
  if ( val ) {
    keys.push(key);
  }
});

There may be easier/shorter ways using plain Underscore.

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In case anyone here uses Lodash instead of Underscore, the following is also possible, which is very short and easy to read:

var keys = _.invert(obj, true)[ "true" ];