Read user input without using the prompt function

Question

The only way to assign value to a user variable in Javascript is by using the function prompt or is there any other?

Because in Python, for example, we can do this:

numero = int(input("Informe um número: "))

I ask this because I am running my Javascript codes in the Node.js terminal and there does not accept the function prompt.

Answer 1

In the Node.js you can use the module readline:

const readline = require('readline');

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

input.question('Informe um número: ', (resposta) => {
  // TODO: Log the answer in a database
  console.log(`Número informado: ${resposta}`);
  input.close();
});

---

If you want to use async/await you can do it this way:

const readline = require('readline');

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

const perguntar = (pergunta) =>  new Promise(resolver => input.question(pergunta, (resposta) => resolver(resposta)));

const executar = async () => {
  console.time('Execução');

  try {
    const resposta = await perguntar('Informe um número: ');
    console.log(`Número informado: ${resposta}`);
  } catch (err) {
    console.log(err)
  }

  // Totaliza o tempo de execução
  console.timeEnd('Execução');
}

executar();

readline

The readline module provides an interface for Reading data from a Readable stream (such as process.stdin) one line at a time.

In free translation:

The readline module provides an interface for reading data from a Readable stream (such as process.stdin) one line at a time.