How to reverse a list in Elixir
What is a list in Elixir?
Lists in Elixir are effectively linked lists, which means that they are internally represented in pairs that contain the list’s head and tail.
What is the best way to reverse a list?
To implement the reversal of a list, we use the Enum and reverse() methods.
The Enum method
Enum is a method to work with enumerables. In this shot, we’ll concentrate on one of these enumerables, list.
The reverse() method
The reverse() method returns a list that has been turned around.
Syntax of reverse()
reverse(enumerable)
Parameters
The reverse() method takes an enumerable, like a list, as a parameter.
How to use Enum and reverse() together
We can use a dot notation to chain the methods together and pass the list as an argument in the reverse() method.
Let’s look at an example:
list = [1, 2, 3]reverse = Enum.reverse(list)IO.inspect reverse, label: "The reverse list is"#⇒ The list is: [1, 2, 3]
Code explanation
-
Line 1: We create a variable called
listand store numbers in it. -
Line 2: We use
Enum.reverse(list)to reverse the list and save it in thereversevariable. Thelistthere is enumerable, as discussed above. -
Line 3: We use
IO.inspectto print the result of thereversevariable.
Output
The output is a list in its reversed state.