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Contents
defmodule Strain do
@doc """
Given a `list` of items and a function `fun`, return the list of items where
`fun` returns true.
Do not use `Enum.filter`.
"""
@spec keep(list :: list(any), fun :: (any -> boolean)) :: list(any)
def keep(list, fun) do
do_keep(list, fun, [])
end
defp do_keep([], _, results), do: Enum.reverse(results)
defp do_keep([head | tail], fun, results) do
case apply(fun, [head]) do
true -> do_keep(tail, fun, [head | results])
_ -> do_keep(tail, fun, results)
end
end
@doc """
Given a `list` of items and a function `fun`, return the list of items where
`fun` returns true.
Do not use `Enum.reject`.
"""
@spec discard(list :: list(any), fun :: (any -> boolean)) :: list(any)
def discard(list, fun) do
do_discard(list, fun, [])
end
defp do_discard([], _, results), do: Enum.reverse(results)
defp do_discard([head | tail], fun, results) do
case apply(fun, [head]) do
true -> do_discard(tail, fun, results)
_ -> do_discard(tail, fun, [head | results])
end
end
end
Version data entries
69 entries across 69 versions & 1 rubygems