Taylor Series using Horner's Rule in Javascript

TaylorSeries.js

function ex(x, n, s = 1) {
  if (n === 0) return s;

  s = 1 + (x * s) / n;

  return ex(x, n - 1, s);
}

console.log(ex(1, 10)); // 2.7182818011463845
console.log(ex(5, 10)); // 146.38060102513225