View Source Fey.Enum (Fey v0.0.3)

Fey.Enum module provides alternatives to some functions from Enum module from the standard library, returning option informing about the result of the lookup. This allows, among others, to distinguish between situation when the found value is nil and when the value is not found.

Summary

Functions

at(enum, index)

Alternative to Enum.at/2 which returns an option: {:some, value} if there is a value at given index or :none if there isn't such element.

find(enum, fun)

Alternative to Enum.find which returns an option: {:some, value} if a value matching the condition is found or :none if no such value was found.

Functions

at(enum, index)

Alternative to Enum.at/2 which returns an option: {:some, value} if there is a value at given index or :none if there isn't such element.

Examples

iex> Fey.Enum.at([1, nil, 2], 1)
{:some, nil}

iex> Fey.Enum.at([1, 2, 3], 5)
:none

iex> Fey.Enum.at([1, nil, :none], 2)
{:some, :none}

iex> Fey.Enum.at(%{a: 1, b: 2}, 1)
{:some, {:b, 2}}

find(enum, fun)

Alternative to Enum.find which returns an option: {:some, value} if a value matching the condition is found or :none if no such value was found.

Examples

iex> Fey.Enum.find([1, 2, 3], &rem(&1, 2) == 0)
{:some, 2}

iex> Fey.Enum.find([1, 3, 5], &rem(&1, 2) == 0)
:none

iex> Fey.Enum.find(%{a: 1, b: 2}, fn {_, v} -> rem(v, 2) == 0 end)
{:some, {:b, 2}}