Allow to use setIn for deep-nested values

[andresmgot]

Hi!

When using Documents, sometimes I need to set a value which parent node doesn't exists (yet) but that ends up in an error:

> d = yaml.parseDocument("foo: bar")
Document {
...
> d.setIn(["a", "b"], 1)
Error: Expected YAML collection at a. Remaining path: b

The above can be done executing d.setIn(["a"], {b: 1}) but I was thinking that it would be helpful for the method setIn to do that for you, similar to how lodash works:

> a = {b: 1}
{ b: 1 }
> lodash.set(a, "c.d", 2)
{ b: 1, c: { d: 2 } }

Do you think this is something doable? Thanks in advance!

[eemeli]

That could work. There's a corner case that'll need to be settled with a path like ['foo', 3]: Should the created object be a map or a sequence?

[andresmgot]

I would say a map? If the intention with ['foo', 3] is to set the fourth element of a sequence that doesn't exists, it wouldn't be logic to fill the rest of the sequence (elements from 0 to 2) with empty values. Is that what you mean?

[eemeli]

Finally got around to implementing this. Went with non-negative integer keys creating sequences + everything else creating maps, as that's what Lodash also does.