read multiple using event listener

read.js

const { EventEmitter } = require('events');
const { readFileSync } = require('fs');

const displayMultiple = (number, factor) =>
  console.log(`${number} is a multiple of ${factor}`);

const readMultiple = function () {
  const [, , fileName, factor] = process.argv;
  const numbers = readFileSync(fileName, 'utf8').split('\n').map(Number);

  const factorEmitter = new EventEmitter();

  factorEmitter.once('multiple', () => console.log('I found first multiple '));
  factorEmitter.on('multiple', displayMultiple);
  numbers.forEach(number => {
    if (number % factor == 0) factorEmitter.emit('multiple', number, factor);
  });
  factorEmitter.removeListener('multiple', displayMultiple);
};

readMultiple();