View Source Quark.Compose (Quark v2.3.3-doma)
Function composition is taking two functions, and joining them together to create a new function. For example:
examples
Examples
iex> sum_plus_one = compose([&(&1 + 1), &Enum.sum/1])
...> sum_plus_one.([1,2,3])
7In this case, we have joined Enum.sum with a function that adds one,
to create a new function that takes a list, sums it, and adds one.
Note that composition normally applies from right to left, though Quark
provides the opposite in the form of *_forward functions.
Link to this section Summary
Functions
Infix "forward" compositon operator
Function composition, from the tail of the list to the head
Function composition
Compose functions, from the head of the list of functions.
Function composition, from the head to tail (left-to-right)
Link to this section Functions
Infix "forward" compositon operator
examples
Examples
iex> sum_plus_one = (&Enum.sum/1) <~> fn x -> x + 1 end
...> sum_plus_one.([1, 2, 3])
7
iex> x200 = (&(&1 * 2)) <~> (&(&1 * 10)) <~> (&(&1 * 10))
...> x200.(5)
1000
iex> add_one = &(&1 + 1)
...> piped = [1, 2, 3] |> Enum.sum() |> add_one.()
...> composed = [1, 2, 3] |> ((&Enum.sum/1) <~> add_one).()
...> piped == composed
trueFunction composition, from the tail of the list to the head
examples
Examples
iex> sum_plus_one = compose([&(&1 + 1), &Enum.sum/1])
...> [1,2,3] |> sum_plus_one.()
7Function composition
examples
Examples
iex> sum_plus_one = compose(&(&1 + 1), &Enum.sum/1)
...> [1, 2, 3] |> sum_plus_one.()
7Compose functions, from the head of the list of functions.
examples
Examples
iex> sum_plus_one = compose_forward([&Enum.sum/1, &(&1 + 1)])
...> sum_plus_one.([1, 2, 3])
7Function composition, from the head to tail (left-to-right)
examples
Examples
iex> sum_plus_one = compose_forward(&Enum.sum/1, &(&1 + 1))
...> [1, 2, 3] |> sum_plus_one.()
7