Hi everyone today we find the Factorial of a Number in Javascript. let's discuss how to solve this problem statement. if you want to check out yesterday's problem click here. We will discuss two methods to solve this problem using Javascript

• Method 1: Iterative approach for factorial

• Method 2: Recursive approach for factorial

Method 1: Iterative approach for factorial

Algorithm

• step 1: Start the program.

• step 2: Declare a function called factorial that takes a single parameter n.

• step 3: Inside the factorial function, initialize a variable called res to 1.

• step 4: Use a for loop to iterate over numbers from 2 to n (inclusive), with a variable called i.

• step 5: Inside the for loop, multiply the res variable with the current value of i, and store the result back in the res variable.

• step 6: After the for loop, return the value of the res variable.

• step 7: Declare a variable called num and assign it a value of 6.

• step 8: Call the factorial function with the num variable as an argument, and store the result in a variable called factorialResult.

• step 9: Use console.log to print the string "Factorial of ", followed by the value of num, followed by the string " is ", followed by the value of factorialResult.

• step 10: End the program.

Javascript Code

// Method to find factorial of the given number
function factorial(n) {
    let res = 1;
    for (let i = 2; i <= n; i++) {
        res *= i;
    }
    return res;
}

// Driver method
let num = 6;
console.log("Factorial of " + num + " is " + factorial(num));

Output

Factorial of 6 is 720

Method 2: Recursive approach for factorial

Algorithm

• step 1: Start the program.

• step 2: Declare a function called factorial that takes a single parameter n.

• step 3: Inside the factorial function, check if the value of n is equal to 0 using the === operator.

• step 4: If n is equal to 0, return 1.

• step 5: If n is not equal to 0, calculate the factorial of n-1 by calling the factorial function recursively, and multiply the result with the value of n.

• step 6: Return the result.

• step 7: Declare a variable called num and assign it a value of 6.

• step 8: Call the factorial function with the num variable as an argument, and store the result in a variable called factorialResult.

• step 9: Use console.log to print the string "Factorial of ", followed by the value of num, followed by the string " is ", followed by the value of factorialResult.

• step 10: End the program.

Javascript Code

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

// Driver method
let num = 6;
console.log("Factorial of " + num + " is " + factorial(num));

Output

Factorial of 6 is 720

Conclusion

So this article we solved the problem statement using javascript language. I hope you found this article helpful for your web development journey.

• If you fill this article informative please like this article, if you have any suggestions please comment on this article, share it on social media and follow me on

• Hashnode - Gaurav Patil

• Twitter - @GauravYPatil