dreamingechoes/30-seconds-of-elixir-code

Curated collection of useful Elixir snippets that you can understand in 30 seconds or less.

30 Seconds Of Elixir Code

A curated collection of useful Elixir snippets that you can understand in 30 seconds or less.

Note: This project is inspired by 30 Seconds Of Code, but there's no affiliation of any kind with that project.

✨ Always work in progress ✨

Table of Contents

📚 Array

View contents

• all_equal
• array_to_csv
• bifurcate

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📚 Array

all_equal

Check if all the elements in an array are equal.

def all_equal(arr), do: arr |> Enum.dedup() |> Enum.count() == 1

Examples

all_equal([1, 2, 3, 4, 5, 6])  # false
all_equal([1, 1, 1])           # true

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array_to_csv

Converts a 2D array to a comma-separated values (CSV) string.

def array_to_csv(arr), do: arr |> Enum.join(",")

Examples

array_to_csv([1, 2, 3, 4])    # "1,2,3,4"

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bifurcate

Splits values into two groups. If an element in filter is truthy, the corresponding element in the collection belongs to the first group; otherwise, it belongs to the second group.

def bifurcate(arr, predicate) do
  Enum.reduce(
    arr,
    %{a: [], b: []},
    fn x, ac ->
      if (predicate.(x)) do
        %{a: [x] ++ ac[:a], b: ac[:b]}
      else
        %{a: ac[:a], b: [x] ++ ac[:b]}
      end
    end
  )
end

Examples

bifurcate([1, 2, 3, 4], fn x -> rem(x, 2) == 0 end)
# %{a: [4, 2], b: [3, 1]}

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Contributing

You can contribute to this project by sending a pull request with your new code snippets, or by creating a new issue if you want that a new section or snippet is added. Here you have the alphabetical list of contributors of this repository.

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This project was developed by dreamingechoes. It adheres to its code of conduct and contributing guidelines, and uses an equivalent license.