Elixir:
no_fives = fn x, y -> x..y |> Enum.map(& Integer.to_string(&1)) |> Enum.filter(& !String.contains?(&1, "5")) |> Enum.count() end
And surprise! I wrote an F# solution in a similar fashion:
let no_fives x y = [x .. y] |> Seq.map string |> Seq.filter (fun x -> x.Contains("5") |> not) |> Seq.length
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Elixir:
And surprise! I wrote an F# solution in a similar fashion: