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mneme
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Snapshot testing tool using familiar assertions
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lib/mneme/utils.ex
defmodule Mneme.Utils do
@moduledoc false
@doc """
Returns the occurrences of a given character in a string.
## Examples
iex> occurrences("foo", ?o)
2
iex> occurrences("foo", ?z)
0
"""
def occurrences(string, char) when is_binary(string) and is_integer(char) do
occurrences(string, char, 0)
end
defp occurrences(<<char, rest::binary>>, char, acc), do: occurrences(rest, char, acc + 1)
defp occurrences(<<_, rest::binary>>, char, acc), do: occurrences(rest, char, acc)
defp occurrences(<<>>, _char, acc), do: acc
end