REnum

REnum is Enum extended with convenient functions inspired by Ruby and Rails ActiveSupport. It also provides full support for native functions through metaprogramming. In addition to REnum, modules such as RList, RMap, RRange can also be used.

REnum
- Installation
- About REnum
- About RList
  - push/2
  - combination/2
  - fill/3
  - dig/3
  - intersection/2
  - sample/2
  - values_at/1
  - second/1
  - from/2
  - to_sentence/2
  - new/2
- About RMap
- About RRange
- About RUtils
- Progress

Installation

def deps do
  [
    {:r_enum, "~> 0.6"}
  ]
end

For the full list of available functions, see API Reference.

About REnum

All the functions are available defined in

compact/1

Returns an list of all non-nil elements.

iex> REnum.compact([1, nil, 2, 3])
[1, 2, 3]
# See also REnum.ActiveSupport.compact_blank

each_slice/2

Returns Stream given enumerable sliced by each amount.

iex> ["a", "b", "c", "d", "e"]
iex> |> REnum.each_slice(2)
iex> |> Enum.to_list()
[["a", "b"], ["c", "d"], ["e"]]

grep/2

Returns elements selected by a given pattern or function.

iex> ["foo", "bar", "car", "moo"]
iex> |> REnum.grep(~r/ar/)
["bar", "car"]

iex> 1..10
iex> |> REnum.grep(3..8)
[3, 4, 5, 6, 7, 8]

reverse_each/2

Calls the function with each element, but in reverse order; returns given enumerable.

iex> REnum.reverse_each([1, 2, 3], &IO.inspect(&1))
# 3
# 2
# 1
[1, 2, 3]

pluck/2

Extract the given key from each element in the enumerable.

iex> payments = [
...>   %Payment{dollars: 5, cents: 99},
...>   %Payment{dollars: 10, cents: 0},
...>   %Payment{dollars: 0, cents: 5}
...> ]
iex> REnum.pluck(payments, [:dollars, :cents])
[[5, 99], [10, 0], [0, 5]]
iex> REnum.pluck(payments, :dollars)
[5, 10, 0]
iex> REnum.pluck([], :dollars)
[]

exclude?/2

The negative of the Enum.member?.Returns true+if the collection does not include the object.

iex> REnum.exclude?([2], 1)
true

iex> REnum.exclude?([2], 2)
false
# See also REnum.ActiveSupport.include?

without/2

Returns enumerable excluded the specified elements.

iex> REnum.without(1..5, [1, 5])
[2, 3, 4]

iex> REnum.without(%{foo: 1, bar: 2, baz: 3}, [:bar])
%{foo: 1, baz: 3}
# See also REnum.ActiveSupport.including

many?/2

Returns true if the enumerable has more than 1 element.

iex>  REnum.many?([])
false

iex> REnum.many?([1])
false

iex> REnum.many?([1, 2])
true

iex> REnum.many?(%{})
false

iex> REnum.many?(%{a: 1})
false

iex> REnum.many?(%{a: 1, b: 2})
true

list_and_not_keyword?/1

Returns true if argument is list and not keyword list.

iex> REnum.list_and_not_keyword?([1, 2, 3])
true

iex> REnum.list_and_not_keyword?([a: 1, b: 2])
false

map_and_not_range?/1

Returns true if argument is map and not range.

iex> REnum.map_and_not_range?(%{})
true

iex> REnum.map_and_not_range?(1..3)
false

About RList

RList is List extended with convenient functions inspired by Ruby and Rails ActiveSupport. All the functions are available defined in

push/2

Appends trailing elements.

iex> [:foo, 'bar', 2]
iex> |> RList.push([:baz, :bat])
[:foo, 'bar', 2, :baz, :bat]

iex> [:foo, 'bar', 2]
iex> |> RList.push(:baz)
[:foo, 'bar', 2, :baz]
# See also REnum.Ruby.shift, REnum.Ruby.pop, REnum.Ruby.unshift

combination/2

Returns Stream that is each repeated combinations of elements of given list. The order of combinations is indeterminate.

iex> RList.combination([1, 2, 3, 4], 1)
iex> |> Enum.to_list()
[[1],[2],[3],[4]]

iex> RList.combination([1, 2, 3, 4], 3)
iex> |> Enum.to_list()
[[1,2,3],[1,2,4],[1,3,4],[2,3,4]]

iex> RList.combination([1, 2, 3, 4], 0)
iex> |> Enum.to_list()
[[]]

iex> RList.combination([1, 2, 3, 4], 5)
iex> |> Enum.to_list()
[]
# See also RList.Ruby.repeated_combination, RList.Ruby.permutation, RList.Ruby.repeated_permutation

fill/3

Fills the list with the provided value. The filler can be either a function or a fixed value.

iex> RList.fill(~w[a b c d], "x")
["x", "x", "x", "x"]

iex> RList.fill(~w[a b c d], "x", 0..1)
["x", "x", "c", "d"]

iex> RList.fill(~w[a b c d], fn _, i -> i * i end)
[0, 1, 4, 9]

iex> RList.fill(~w[a b c d], fn _, i -> i * 2 end, 0..1)
[0, 2, "c", "d"]

dig/3

Finds and returns the element in nested elements that is specified by index and identifiers.

iex> [:foo, [:bar, :baz, [:bat, :bam]]]
iex> |> RList.dig(1)
[:bar, :baz, [:bat, :bam]]

iex> [:foo, [:bar, :baz, [:bat, :bam]]]
iex> |> RList.dig(1, [2])
[:bat, :bam]

iex> [:foo, [:bar, :baz, [:bat, :bam]]]
iex> |> RList.dig(1, [2, 0])
:bat

iex> [:foo, [:bar, :baz, [:bat, :bam]]]
iex> |> RList.dig(1, [2, 3])
nil

intersection/2

Returns a new list containing each element found both in list1 and in all of the given list2; duplicates are omitted.

iex> [1, 2, 3]
iex> |> RList.intersection([3, 4, 5])
[3]

iex> [1, 2, 3]
iex> |> RList.intersection([5, 6, 7])
[]

iex> [1, 2, 3]
iex> |> RList.intersection([1, 2, 3])
[1, 2, 3]
"""

sample/2

Returns one or more random elements.

values_at/1

Returns a list containing the elements in list corresponding to the given selector(s).The selectors may be either integer indices or ranges.

iex> RList.values_at(~w[a b c d e f], [1, 3, 5])
["b", "d", "f"]

iex> RList.values_at(~w[a b c d e f], [1, 3, 5, 7])
["b", "d", "f", nil]

iex> RList.values_at(~w[a b c d e f], [-1, -2, -2, -7])
["f", "e", "e", nil]

iex> RList.values_at(~w[a b c d e f], [4..6, 3..5])
["e", "f", nil, "d", "e", "f"]

iex> RList.values_at(~w[a b c d e f], 4..6)
["e", "f", nil]

second/1

Equal to Enum.at(list, 1).

iex> ~w[a b c d]
iex> |> RList.second()
"b"
# See also RList.ActiveSupport.third, RList.ActiveSupport.fourth, RList.ActiveSupport.fifth and RList.ActiveSupport.forty_two

from/2

Returns the tail of the list from position.

iex> ~w[a b c d]
iex> |> RList.from(0)
["a", "b", "c", "d"]

iex> ~w[a b c d]
iex> |> RList.from(2)
["c", "d"]

iex> ~w[a b c d]
iex> |> RList.from(10)
[]

iex> ~w[]
iex> |> RList.from(0)
[]

iex> ~w[a b c d]
iex> |> RList.from(-2)
["c", "d"]

iex> ~w[a b c d]
iex> |> RList.from(-10)
[]
# See also RList.ActiveSupport.to

to_sentence/2

Converts the list to a comma-separated sentence where the last element is joined by the connector word.

You can pass the following options to change the default behavior. If you pass an option key that doesn't exist in the list below, it will raise an

Options

:words_connector - The sign or word used to join all but the last element in lists with three or more elements (default: ", ").
:last_word_connector - The sign or word used to join the last element in lists with three or more elements (default: ", and ").
:two_words_connector - The sign or word used to join the elements in lists with two elements (default: " and ").

iex> ["one", "two"]
iex> |> RList.to_sentence()
"one and two"

iex> ["one", "two", "three"]
iex> |> RList.to_sentence()
"one, two, and three"

iex> ["one", "two"]
iex> |> RList.to_sentence(two_words_connector: "-")
"one-two"

iex> ["one", "two", "three"]
iex> |> RList.to_sentence(words_connector: " or ", last_word_connector: " or at least ")
"one or two or at least three"

iex> ["one", "two", "three"]
iex> |> RList.to_sentence()
"one, two, and three"

new/2

Make a list of size amount.

iex> 1
iex> |> RList.new(3)
[1, 1, 1]

About RMap

RMap is Map extended with convenient functions inspired by Ruby and Rails ActiveSupport. All the functions are available defined in

dig/2

Returns the object in nested map that is specified by a given key and additional arguments.

iex> RMap.dig(%{a: %{b: %{c: 1}}}, [:a, :b, :c])
1

iex> RMap.dig(%{a: %{b: %{c: 1}}}, [:a, :c, :b])
nil

each_key/2

Calls the function with each key; returns :ok.

iex> RMap.each_key(%{a: 1, b: 2, c: 3}, &IO.inspect(&1))
# :a
# :b
# :c
:ok
# See also RMap.Ruby.each_value, RMap.Ruby.each_pair

except/2

Returns a map excluding entries for the given keys.

iex> RMap.except(%{a: 1, b: 2, c: 3}, [:a, :b])
%{c: 3}

invert/1

Returns a map object with the each key-value pair inverted.

iex> RMap.invert(%{"a" => 0, "b" => 100, "c" => 200, "d" => 300, "e" => 300})
%{0 => "a", 100 => "b", 200 => "c", 300 => "e"}

iex> RMap.invert(%{a: 1, b: 1, c: %{d: 2}})
%{1 => :b, %{d: 2} => :c}

values_at/2

Returns a list containing values for the given keys.

iex> RMap.values_at(%{a: 1, b: 2, c: 3}, [:a, :b, :d])
[1, 2, nil]

deep_atomize_keys/1

Returns a list with all keys converted to atom. This includes the keys from the root map and from all nested maps and arrays.

iex> RMap.deep_atomize_keys(%{"name" => "Rob", "years" => "28", "nested" => %{ "a" => 1 }})
%{name: "Rob", nested: %{a: 1}, years: "28"}

iex> RMap.deep_atomize_keys(%{"a" => %{"b" => %{"c" => 1}, "d" => [%{"a" => 1, "b" => %{"c" => 2}}]}})
%{a: %{b: %{c: 1}, d: [%{a: 1, b: %{c: 2}}]}}
# See also RList.ActiveSupport.deep_symbolize_keys, RList.ActiveSupport.symbolize_keys, RList.ActiveSupport.deep_stringify_keys, RList.ActiveSupport.stringify_keys,

deep_transform_keys/2

Returns a list with all keys converted to atom. This includes the keys from the root map and from all nested maps and arrays.

iex> RMap.deep_transform_keys(%{a: %{b: %{c: 1}}}, &to_string(&1))
%{"a" => %{"b" => %{"c" => 1}}}

iex> RMap.deep_transform_keys(%{a: %{b: %{c: 1}, d: [%{a: 1, b: %{c: 2}}]}}, &inspect(&1))
%{":a" => %{":b" => %{":c" => 1}, ":d" => [%{":a" => 1, ":b" => %{":c" => 2}}]}}
# See also RList.ActiveSupport.deep_transform_values

About RRange

All the functions are available defined in

begin/1

Returns the first element of range.

iex> RList.begin(1..3)
1
# See also RRange.Ruby.end

step/2

Returns Stream that from given range split into by given step.

iex> RList.step(1..10, 2)
iex> |> Enum.to_list()
[1, 3, 5, 7, 9]
"""

overlaps?/2

Compare two ranges and see if they overlap each other.

iex> RList.overlaps?(1..5, 4..6)
true

iex> RList.overlaps?(1..5, 7..9)
false

About RUtils

Some useful functions.

blank?/1

Return true if object is blank, false, empty, or a whitespace string. For example, +nil+, '', ' ', [], {}, and +false+ are all blank.

iex>  RUtils.blank?(%{})
true

iex> RUtils.blank?([1])
false

iex> RUtils.blank?("  ")
true

present?/1

Returns true if not RUtils.blank?

iex> RUtils.present?(%{})
false

iex> RUtils.present?([1])
true

iex> RUtils.present?("  ")
false

define_all_functions!/2

Defines in the module that called all the functions of the argument module.

iex> defmodule A do
...>   defmacro __using__(_opts) do
...>     RUtils.define_all_functions!(__MODULE__)
...>   end
...>
...>   def test do
...>     :test
...>   end
...> end
iex> defmodule B do
...>   use A
...> end
iex> B.test
:test

Progress

REnum	Elixir Module	Ruby Class	Elixir	Ruby	ActiveSupport
REnum	Enum	Enumerable	✅	✅	✅
RList	List	Array	✅	✅	✅
RMap	Map	Hash	✅	✅	✅
RRange	Range	Range	✅	✅	✅
RStream	Stream	Enumerator::Lazy	✅	TODO	TODO

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