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[Sync Iteration] elixir/series/1 #18

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[Sync Iteration] elixir/series/1 #18

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14 changes: 14 additions & 0 deletions solutions/elixir/series/1/lib/string_series.ex
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Original file line number Diff line number Diff line change
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defmodule StringSeries do
@doc """
Given a string `s` and a positive integer `size`, return all substrings
of that size. If `size` is greater than the length of `s`, or less than 1,
return an empty list.
"""
@spec slices(s :: String.t(), size :: integer) :: list(String.t())
def slices(s, size) when size < 1, do: []
def slices(s, size), do: slice(s, size, String.length(s) - size)

defp slice(s, size, position, list \\ [])
defp slice(_, _, position, list) when position < 0, do: list
defp slice(s, size, position, list), do: slice(s, size, position - 1, [String.slice(s, position, size) | list])
end