How to pass a function into another function in the same module in elixir?

Question

In python, we can pass a function into another function like the example code below.

def digits(n):
    return list(map(int, str(n)))

def digit_cube(n):
    return list(map(lambda x: x ** 3, digits(n)))

Can the same be done in elixir? If yes, how?

Aleksei Matiushkin · Accepted Answer · 2021-04-28 10:57:15Z

7

One can pass anonymous functions

f = fn e -> e * 2 end
Enum.map([1, 2, 3], f)

or capture the existing function with &/1

defmodule M do
  def dbl(e), do: e * 2
  def map_dbl(list) do
    Enum.map(list, &dbl/1)
  end
end

answered Apr 28, 2021 at 10:57

Aleksei Matiushkin

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3 Comments

Segfault Over a year ago

it may be worth mentioning Kernel.apply/3 ?

Hauleth Over a year ago

@Segfault I think it would be more interesting to point out remote function captures and differences between remote function capture and local function capture.

Aleksei Matiushkin Over a year ago

@Hauleth but it would be copy-pasting the documentation I have explicitly linked, wouldn’t it?

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