36 lines
685 B
Elixir
36 lines
685 B
Elixir
defmodule CryptoSquare do
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@doc """
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Encode string square methods
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## Examples
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iex> CryptoSquare.encode("abcd")
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"ac bd"
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"""
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@spec encode(String.t()) :: String.t()
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def encode(str) do
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str
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|> normalize()
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|> square()
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end
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defp normalize(str) do
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str
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|> String.downcase()
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|> String.replace(~r/[^a-z0-9]/, "")
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end
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defp square(""), do: ""
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defp square(str) do
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length = String.length(str)
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row = round(ceil(length ** 0.5))
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str
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|> String.split("", trim: true)
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|> Enum.chunk_every(row, row, List.duplicate(" ", row))
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|> Enum.zip()
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|> Enum.map(&Tuple.to_list(&1))
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|> Enum.map_join(" ", &Enum.join(&1))
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end
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end
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