elixir defguard

Elixir defguard Function

In Elixir, the defguard macro is used to define guards, which are conditions that must be satisfied for a function to be invoked. The defguard macro allows you to define custom guards that can be used in function clauses.

Here is an example of how to use the defguard macro:

defmodule MyModule do
  defguard is_even(number) when rem(number, 2) == 0

  def my_function(number) when is_even(number) do
    # Function implementation

In the example above, the defguard macro is used to define the is_even/1 guard, which checks if a number is even. The my_function/1 function uses the is_even/1 guard to ensure that it is only invoked when the input number is even.

You can define multiple guards using the defguard macro, and they can be used in multiple function clauses throughout your code.

I hope this helps! Let me know if you have any further questions.