Raphael Costa costaraphael
costaraphael
/ nice_pattern.exs
Created
May 10, 2019 01:12
Builder pattern in Elixir (don't do this!!!)
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| defmodule Person do | |
| defstruct [:name, :age] | |
| def with do | |
| {Person.Builder, %{}} | |
| end | |
| defmodule Builder do | |
| def unquote(:'$handle_undefined_function')(:and_with, [{__MODULE__, _acc} = tuple]) do | |
| tuple |
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| defmodule Permutations do | |
| def permutate([]), do: [[]] | |
| def permutate(list) do | |
| for n <- list, | |
| p <- permutate(list -- [n]), | |
| do: [n | p] | |
| end | |
| end |