Ask

Asks question on the console, and gives what's typed, or default for nothing.

Asks question on the console, and gives what's typed, or default for nothing, once validate gives Null for it; while it doesn't, what it gives says what's wrong, and the question goes on.

Examples

Local terminal = FakeTerminal(interactive: False)
terminal.Feed("\n42\n")
// What validate gives says what's wrong with an answer, or Null for one that's right.
Local number = Function(text: String): String? => Int.Parse(text) == Null ? "a number" : Null
Local age = Ask(terminal, "Age?", number)
Expect(age == "42")
Expect(terminal.Output.Contains("a number"))

Asks question on terminal, and gives what's typed, or default for nothing.

Asks question on terminal, and gives what's typed, or default for nothing, once validate gives Null for it; while it doesn't, what it gives says what's wrong, and the question goes on.