Immutability in elixir¶

When working with elixir, we never modify an existing data structure.

For example, when passing a list of method, instead of modifying it, it creates a copy of it, modifies it and returns the copy.

This concept is called Immutability.

So, in previous section, when calling the shuffle method on a deck. It doesn't actually shuffles the existing deck, it creates a copy of it and then shuffles it.