Write a JavaScript program to find the factorial of a number

Description: Find the factorial of 5 in two ways: with a loop and with a recursive function.

Hint:

• Factorial of 5 is 5 x 4 x 3 x 2 x 1 = 120.
• A recursive function needs a base case.

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JavaScript factorial program

// loop
let fact = 1;
for (let i = 1; i <= 5; i++) {
  fact *= i;
}
console.log(fact);

// recursion
function factorial(n) {
  if (n <= 1) return 1;       // base case
  return n * factorial(n - 1);
}
console.log(factorial(5));

Output:

How it works

• The loop multiplies fact with 1, 2, 3, 4 and 5.
• The recursive function calls itself with a smaller number until it reaches the base case.

Read JavaScript Functions.

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