Normal (binary) function composition

iex> sum_plus_one = b(&(&1 + 1), &Enum.sum/1)
iex> [1,2,3] |> sum_plus_one.()
7

Reverse (first) two arguments (flip)

iex> c(&div/2).(1, 2)
2

iex> reverse_concat = c(&Enum.concat/2)
iex> reverse_concat.([1,2,3], [4,5,6])
[4,5,6,1,2,3]

Apply the same argument to a functon twice

iex> repeat = w(&Enum.concat/2)
iex> repeat.([1,2])
[1,2,1,2]

iex> w(&Enum.zip/2).([1,2,3])
[{1, 1}, {2, 2}, {3, 3}]