freeCodeCamp/guide/english/elixir/lists/index.md

title
Lists

Lists

In Elixir, lists are data structures comprised of values within square brackets. The values in a list can be any type.

iex> [1, "string", true]
[1, "string", true]

Immutability

Data structures in Elixir are immutable, so any operations performed on a List will return a new list, leaving the original intact.

iex> list = [1, "string", true]
[1, "string", true]
iex> list ++ [2]
[1, "string", true, 2]
iex> list
[1, "string", true]

Heads and Tails

The head (first element) of a list and the tail (remaining values) can easily accessed with the hd/1 and tl/1 operators.

iex> list = [1, "string", true]
iex> hd(list)
1
iex> tl(list)
["string", true]

More Information:

• elixir-lang.org | recursion
• hexdocs | Enum