NumberLab.js

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

rl.question('Please enter a number: ', value => {
  if (!(/[\-0-9]+/.test(value))) {
    console.log("That's not a number. I said enter a number.")
    process.exit(1);
  }
  let lengthWithNull = function(x) {
    return x ? x.length : 0;
  }
  var odds = lengthWithNull(value.match(/[13579]/g));
  var evens = lengthWithNull(value.match(/[2468]/g));
  var zeros = lengthWithNull(value.match(/[0]/g));
  console.log("Evens: " + evens);
  console.log("Odds: " + odds);
  console.log("Zeros: " + zeros);
  rl.close();
});