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lib/swiss.ex
defmodule Swiss do
@moduledoc """
# Swiss
Swiss is a bundle of extensions to the standard lib. It includes several
helper functions for dealing with standard types.
## API
The root module has generic helper functions; check each sub-module's docs for
each type's API.
"""
@doc """
Applies the given `func` to `value` and returns its result.
### Examples
iex> Swiss.thru(42, &(12 + &1))
54
"""
@spec thru(value :: any(), func :: function()) :: any()
def thru(value, func), do: func.(value)
@doc """
Applies the given `func` to `value` and returns value.
### Examples
iex> Swiss.tap(42, &(12 + &1))
42
"""
@spec tap(value :: any(), func :: function()) :: any()
def tap(value, func) do
func.(value)
value
end
@doc """
Wrapper that makes any function usable directly in `Kernel.get_in/2`.
### Examples
iex> get_in([%{"life" => 42}], [Swiss.nextable(&List.first/1), "life"])
42
"""
def nextable(fun) do
fn :get, el, next ->
next.(fun.(el))
end
end
end