Simple lotto numbers generator

lotto.js

function lotto(amountOfNumbers, from, to) {
  const numbers = [];
  for (let i = 0; i < amountOfNumbers; i++) {
    let number = null;
    while (number === null || numbers.indexOf(number) > -1) {
      number = Math.floor(Math.random() * (to - from + 1)) + from;
    }
    numbers.push(number);
  }
  return numbers.sort((a, b) => a - b);
}