What does the abbreviation in function mean?

Question

JavaScript

I have a factorial function

function factorial(n) {
  return (n < 2) ? 1 : factorial(n - 1) * n;
}

what does this entry mean: factorial(n - 1)? How else to write it down?

Thanks everyone, got it)

Answer 1

As already said, this is recursion, this factorial code can be rewritten somehow like this.

function factorial(n) {
  let f = 1;

  for (let i = 2; i <= n; i++) {
    f *= i;
  }

  return f;
}