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[](https://hex.pm/packages/r_enum)
[](https://github.com/tashirosota/ex-r_enum/actions/workflows/ci.yml)
# REnum
**Many useful functions implemented.**
REnum is Enum extended with convenient functions inspired by Ruby and Rails ActiveSupport.
It also provides full support for native functions through metaprogramming.
## Installation
```elixir
def deps do
[
{:r_enum, "~> 0.1"}
]
end
```
## Usage
You can use all of `Enum.Enumerable.*` functions through REnum Module.
```elixir
# Examples.
# REnum.Ruby.compact/1
iex> [1, nil, 2, 3]
iex> |> REnum.compact()
[1, 2, 3]
# REnum.Ruby.grep/2
iex> ["foo", "bar", "car", "moo"]
iex> |> REnum.grep(~r/ar/)
["bar", "car"]
# REnum.Ruby.each_slice/2
iex> [1, 2, 3, 4, 5, 6, 7]
iex> |> REnum.each_slice(3)
iex> |> REnum.to_list()
[[1, 2, 3], [4, 5, 6], [7]]
# REnum.ActiveSupport.pluck/2
iex> payments = [
...> %Payment{dollars: 5, cents: 99},
...> %Payment{dollars: 10, cents: 0},
...> %Payment{dollars: 0, cents: 5}
...> ]
iex> |> REnum.pluck(:dollars)
[5, 10, 0]
# REnum.ActiveSupport.maximum/2
iex> REnum.maximum(payments, :dollars)
10
# REnum.ActiveSupport.without/2
iex> 1..5
iex> |> REnum.without([1, 5])
[2, 3, 4]
# RList.Ruby.combination/2
iex> [1, 2, 3, 4]
iex> RList.combination(3)
iex> |> Enum.to_list()
[[1,2,3],[1,2,4],[1,3,4],[2,3,4]]
# See also RList.Ruby.repeated_combination, RList.Ruby.permutation, RList.Ruby.repeated_permutation
iex> [:foo, 'bar', 2]
iex> |> RList.push([:baz, :bat])
[:foo, 'bar', 2, :baz, :bat]
# See also RList.Ruby.pop, RList.Ruby.shift, RList.Ruby.unshift
# Aliases.
# REnum.Ruby.select2
iex> [1, 2, 3]
iex> |> REnum.select(fn x -> rem(x, 2) == 0 end) ==
iex> Enum.filter([1, 2, 3], fn x -> rem(x, 2) == 0 end)
true
# Can use Elixir's Enum functions too.
# REnum.Ruby.find/2
iex> [1, 2, 3]
iex> |> REnum.find(fn x -> rem(x, 2) == 1 end)
3
# REnum.Ruby.sort/1
iex> [1, 2, 3]
iex> REnum.sort()
[1, 2, 3]
```
For the full list of available functions, see [API Reference](https://hexdocs.pm/r_enum/api-reference.html).
## Docs
See **[hexdocs](https://hexdocs.pm/r_enum)**.
## Roadmap
- [x] 0.1.0
- REnum.Native
- REnum.Ruby
- REnum.Support
- RList.Native
- RMap.Native
- RRange.Native
- RStream.Native
- RUtils
- [x] 0.2.0
- REnum.ActiveSupport
- [ ] 0.4.0
- RList.Ruby
- [ ] 0.5.0
- RList.ActiveSupport
- [ ] 0.6.0
- RMap.Ruby
- RMap.ActiveSupport
- [ ] 0.7.0
- RRange.Ruby
- RRange.ActiveSupport
- [ ] 0.8.0
- RStream.Ruby
- RStream.ActiveSupport
## Progress
| REnum | Elixir Module | Ruby Class | Elixir | Ruby | ActiveSupport |
| ------- | ------------- | ---------------- | :----: | :--: | :-----------: |
| REnum | Enum | Enumerable | ✅ | ✅ | ✅ |
| RList | List | Array | ✅ | ✅ | TODO |
| RMap | Map | Hash | ✅ | TODO | TODO |
| RRange | Range | Range | ✅ | TODO | TODO |
| RStream | Stream | Enumerator::Lazy | ✅ | TODO | TODO |
