How to resolve the algorithm Keyboard input/Obtain a Y or N response step by step in the Elm programming language

Published on 12 May 2024 09:40 PM
#Elm

How to resolve the algorithm Keyboard input/Obtain a Y or N response step by step in the Elm programming language

Table of Contents

Problem Statement

Obtain a valid   Y   or   N   response from the keyboard. The keyboard should be flushed, so that any outstanding key-presses are removed, preventing any existing   Y   or   N   key-press from being evaluated. The response should be obtained as soon as   Y   or   N   are pressed, and there should be no need to press an   enter   key.

Let's start with the solution:

Step by Step solution about How to resolve the algorithm Keyboard input/Obtain a Y or N response step by step in the Elm programming language

Source code in the elm programming language

import Char
import Graphics.Element exposing (Element, empty, show)
import Keyboard


view : Int -> Element
view keyCode =
  let
    char = 
      Char.fromCode keyCode

    showChar =
      toString >> ((++) "The last (y/n) key pressed was: ") >> show
  in
    case char of
      'n' ->
        showChar char

      'y' ->
        showChar char

      _ ->
        empty


main : Signal Element
main =
  Signal.map view Keyboard.presses

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