How do you round numbers in JavaScript?

5qpt0yu.js

function roundUp(num, prec) {
  prec = Math.pow(10, prec);
  return Math.ceil(num * prec) / prec;
}

function roundDown(num, prec) {
  prec = Math.pow(10, prec);
  return Math.floor(num * prec) / prec;
}
// Built in Math function
console.log(Math.round(10.5)) // --> 11

// Custom Math Functions for Rounding Up/Down based on Precision
console.log(roundUp(1.85, 1)) // --> 1.9
console.log(roundDown(1.85, 1)) // --> 1.8