Find Factorial of a Number

Function that calculates the factorial of a given number:

You can create a function to calculate the factorial of a given number using recursion or iteration. Here's how you can implement it using recursion:

function factorial(n) {
    // Base case: factorial of 0 is 1
    if (n === 0) {
        return 1;
    }
    // Recursive case: n * factorial(n-1)
    return n * factorial(n - 1);
}

// Example usage:
console.log(factorial(5));
 // Output: 120 (5! = 5 * 4 * 3 * 2 * 1 = 120)

And here's how you can implement it using iteration:

function factorial(n) {
    let result = 1;
    // Multiply result by each integer from 1 to n
    for (let i = 1; i <= n; i++) {
        result *= i;
    }
    return result;
}

// Example usage:
console.log(factorial(5));
// Output: 120 (5! = 5 * 4 * 3 * 2 * 1 = 120)

120

Explanation:

Both implementations achieve the same result. The recursive implementation calls itself with a smaller value until it reaches the base case (factorial of 0), while the iterative implementation uses a loop to multiply each integer from 1 to n to calculate the factorial. Choose the one that suits your preference or requirements.

• Learn in-depth concepts of factorial number from the algorithm page.