Sha256: a575bed501830ed5e80632d6c0209eee74b235152ce1542b8b6698538bdc8278
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Size: 793 Bytes
Versions: 69
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Stored size: 793 Bytes
Contents
defmodule Diamond do
@doc """
Given a letter, it prints a diamond starting with 'A',
with the supplied letter at the widest point.
"""
@spec build_shape(char) :: String.t()
def build_shape(letter) do
pos = letter - 64
size = pos * 2 - 1
half = build_half_diamond(pos, size)
Enum.join([half | Enum.slice(Enum.reverse(half), 1, length(half))])
end
defp build_half_diamond(rows, row_size) do
Enum.reduce(0..(rows - 1), [], fn x, acc ->
List.duplicate("\s", row_size)
|> List.update_at(rows - 1 - x, fn _ -> <<65 + x>> end)
|> Enum.reverse()
|> List.update_at(rows - 1 - x, fn _ -> <<65 + x>> end)
|> List.insert_at(row_size + 1, "\n")
|> List.duplicate(1)
|> Enum.concat(acc)
end)
|> Enum.reverse()
end
end
Version data entries
69 entries across 69 versions & 1 rubygems