Node.js
Readline

Sintaxis

• const readline = require ('readline')
• readline.close ()
• readline.pause ()
• readline.prompt ([preserveCursor])
• readline.question (consulta, devolución de llamada)
• readline.resume ()
• readline.setPrompt (indicador)
• readline.write (datos [, clave])
• readline.clearLine (stream, dir)
• readline.clearScreenDown (secuencia)
• readline.createInterface (opciones)
• readline.cursorTo (secuencia, x, y)
• readline.emitKeypressEvents (flujo [, interfaz])
• readline.moveCursor (secuencia, dx, dy)

Lectura de archivos línea por línea

const fs = require('fs');
const readline = require('readline');

const rl = readline.createInterface({
    input: fs.createReadStream('text.txt')
});

// Each new line emits an event - every time the stream receives \r, \n, or \r\n
rl.on('line', (line) => {
    console.log(line);
});

rl.on('close', () => {
    console.log('Done reading file');
});

Solicitar la entrada del usuario a través de CLI

const readline = require('readline');

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

rl.question('What is your name?', (name) => {
    console.log(`Hello ${name}!`);

    rl.close();
});