User-Input.md

Reading STDIN user input

Using prompt()

Reading in input from the user can be done using prompt() .

prompt() will only work in browsers, not in IDE's such as VSCode.

const iOSMessage = 'Looks like you develop for Apple devices.'; 
const webMessage = 'Hello, full stack dev.'; 

const input = Number(prompt('Please enter 1 for Swift or 2 for Web?'));

if (input === 1) {
  console.log(iOSMessage);
} else {
  console.log(webMessage); 
}

Try it in repl.it

readline package

var readline = require("readline");

const r1 = readline.createInterface({
    input: process.stdin, 
    output: process.stdout
}); 

r1.question('Do you want to hit or pass ?', (answer) => {
    console.log(`You entered ${answer}`); 

    r1.close(); 
}); 

Looping with readline

In order to create a looping structure e.g creating a Text Adventure game or a BlackJack game using readline you must use a recursive function as a while or do...while won't execute continuosuly using readline.

const gamePlay = function() {
  r1.question('Enter yes or no?', (answer) => {
    console.log(`You answered ${answer}`); 
    if (answer !== 'yes') {
      return r1.close(); 
    }
    gamePlay(); 
  }); 
}; 

gamePlay(); 

Stackoverflow - How to readline infinitely in node

Resource

1. MDN - Window.prompt()