Kernel.put_in

You're seeing just the function put_in, go back to Kernel module for more information.

put_in(data, keys, value)

Specs

put_in(Access.t(), [term(), ...], term()) :: Access.t()

Puts a value in a nested structure.

Uses the Access module to traverse the structures according to the given keys, unless the key is a function. If the key is a function, it will be invoked as specified in get_and_update_in/3.

Examples

iex> users = %{"john" => %{age: 27}, "meg" => %{age: 23}}
iex> put_in(users, ["john", :age], 28)
%{"john" => %{age: 28}, "meg" => %{age: 23}}

In case any of the entries in the middle returns nil, an error will be raised when trying to access it next.