pick should allow deep paths?

[WickyNilliams]

var object = { 'a': 1, 'b': '2', 'c': { d : 3 }};
 
_.pick(object, ['a', 'c.d']);

I'd expect this to return:

{
  a : 1,
  d : 3
}

but it actually returns

{
  a : 1,
  c: {
    d : 3
  }
}

which is equivalent to _.pick(object, ["a", "c"])

[jdalton]

Hi @WickyNilliams!

Lodash supports deep pick, just not in the way you want. It will construct an object of your picked properties leaving the object namespaces in place. What you want is a bit of a flattening. Maybe this could be done with reduce

_.reduce(['a','c.d'], (o, p) => _.set(o, _.get(object, p)), {})

[WickyNilliams]

Aha! That makes sense. I would have realised that had my example been the following:

var object = { 'a': 1, 'b': '2', 'c': { d : 3, e : 4 }};
 
_.pick(object, ['a', 'c.d']);

The c.d.e property is excluded from the result.

Thanks!

[alexandrusavin]

Just a small correction on the example: _.set takes a path.

_.reduce(['a','c.d'], (o, p) => _.set(o, p, _.get(object, p)), {})

[lock]

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