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defmodule Transpose do
@doc """
Given an input text, output it transposed.
Rows become columns and columns become rows. See https://en.wikipedia.org/wiki/Transpose.
If the input has rows of different lengths, this is to be solved as follows:
* Pad to the left with spaces.
* Don't pad to the right.
## Examples
iex> Transpose.transpose("ABC\nDE")
"AD\nBE\nC"
iex> Transpose.transpose("AB\nDEF")
"AD\nBE\n F"
"""
@spec transpose(String.t) :: String.t
def transpose(matrix) do
rows = String.split(matrix, "\n")
max_length = get_longest_row_length(rows)
rows
|> Enum.map(fn x -> get_padded_row(x, max_length) end)
|> Enum.map(fn x -> String.to_charlist(x) end)
|> List.zip
|> Enum.map(fn x -> Tuple.to_list(x) end)
|> Enum.map(fn x -> List.to_string(x) end)
|> Enum.map(fn x -> String.replace(x, "*", " ") end)
|> Enum.join("\n")
|> String.trim_trailing
end
defp get_longest_row_length(rows) do
rows
|> Enum.map(fn row -> String.length(row) end)
|> Enum.max
end
defp get_padded_row(row, max_length) do
padding = String.duplicate("*", max_length - String.length(row))
row <> padding
end
end
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63 entries across 63 versions & 1 rubygems