#development #elixir

To efficiently work with and transform lists in Elixir, you will likely need utilize a list reversing function from time to time. Your best bet is to reach for the Erlang implementation which is available as part of the lists module.

Here are a couple examples of how to use it:

1> :lists.reverse([1,2,3])
2[3, 2, 1]
3> :lists.reverse([1, :a, true, "what", 5])
4[5, "what", true, :a, 1]

Note: though I said "transform lists" above, what is actually going on is that a new version of the list representing my transformation is being created, per Elixir's functional nature.

Elixir now has a built-in function for reversing lists. In fact, it works with anything that implements the Enumerable protocol.

1> Enum.reverse([1,2,3,4,5])
2[5, 4, 3, 2, 1]
3> Enum.reverse(%{a: 1, b: 2, c: 3})
4[c: 3, b: 2, a: 1]

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