Captures

import IEx.Helpers

Intuition

fun = &(&1 + 1)

# x + 1

#Function<42.105768164/1 in :erl_eval.expr/6>

fun.(42)

43

i(fun)

Term
  #Function<42.105768164/1 in :erl_eval.expr/6>
Data type
  Function
Type
  local
Arity
  1
Description
  This is an anonymous function.
Implemented protocols
  Enumerable, IEx.Info, Inspect

fun2 = &(&1 + &2)

&:erlang.+/2

fun2.(42, 43)

85

fun3 = &(&1 + &1)

#Function<42.105768164/1 in :erl_eval.expr/6>

fun3.(4)

8

Performance

&[&1|&2]

or

fn item, list ->
  [item|list]
end

prefer using anonymous function in elixir

fn item, list ->
  [item|list]
end

over

&[&1|&2]

unless!!!

prefer:

&IO.inspect/1

over:

fn item -> IO.inspect(item) end

prefer &IO.inspect/1

• initial ampersand marks as capture