put in

place a value in a nested data structure

(any xs, list keys, any value) -> any

Given a dict or list of xs, returns the same type of collection with value placed at the end of navigating through the list of keys.

If any intermediate structures have to be created, they will be, depending on key type. String keys create dicts. Long keys create lists.

If a value is placed in a list, any undefined indexes are filled with nil.

Returns nil if xs is nil.

Throws an error if xs is neither a dict nor a list.

Throws an error if xs keys is nil.

Throws an error when trying to access a data structure that is neither a dict or list.

Throws an error or when a key value cannot be cast to the appropriate key type of the data structure.

Parameters