Anonymous Functions

fn...end

Anonymous functions are created with fn and called with a dot:

double = fn x -> x * 2 end
IO.puts(double.(5))   # 10

The dot . is required when calling anonymous functions in Elixir.

Capture Syntax &

The & shorthand lets you write compact anonymous functions:

add = &(&1 + &2)
IO.puts(add.(3, 4))   # 7

&1, &2 refer to the first and second arguments.

Your Turn

1. Create double = fn x -> x * 2 end and print double.(5) → 10
2. Create add = &(&1 + &2) and print add.(3, 4) → 7
3. Create square = &(&1 * &1) and print square.(6) → 36