series

elixir/series/lib/string_series.ex

@@ -0,0 +1,12 @@
+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) do
+    length = String.length(s)
+    for start <- 0..(length - size), size in 1..length, into: [], do: String.slice(s, start, size)
+  end
+end