Answers for "how to find factorial of number in javascript"

javascript factorial

function factorial(n) {
  if (n < 0) return;
  if (n < 2) return 1;
  return n * factorial(n - 1);
}

Factorial in javascript

function factorial(n) {
    if (n == 1) {
        return 1;
    }
    return n * factorial(n - 1);
}
console.log(factorial(6));
//Output: 720

js how to calculate factorial

// @ts-check
/* ---------------------------------- using a loop --------------------------------- */
(() => {
  function factorial(n) {
    if (n < 0) return;

    let result = 1;

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

    return result;
  }

  console.log(factorial(4)); // => 24
  console.log(factorial(0)); // => 1
  console.log(factorial(-2)); // => undefined
})();

/* ------------------------------ recursive way----------------------------- */
(() => {
  function factorial(n) {
    if (n < 0) return;
    if (n == 0) return 1;

    return n == 1 ? 1 : n * factorial(n - 1);
  }

  console.log(factorial(5)); // => 120
  console.log(factorial(0)); // => 1
})();