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Stdlib Recipes

Parse all valid integers from text list​

let numbers = ["1"; "x"; "3"] |> List.choose Int.tryParse

Normalize and deduplicate names​

let names =
  ["Ada"; "ada"; "BOB"]
  |> List.map String.toLower
  |> List.distinct

Build a config map with defaults​

let config = Map.add "host" "localhost" Map.empty
let host = config |> Map.tryGet "host" |> Option.defaultValue "127.0.0.1"

Keep only positive values in a map​

let filtered =
  { ["a"] = 1; ["b"] = -1 }
  |> Map.filter (fun _ value -> value > 0)