JavaScript Code to Find Factorial of a Number

JavaScript Code to Find Factorial of a Number

Hi developers, in this post you will learn how to Write a Program in JavaScript to find the factorial of a number in different ways.


Before that let's understand:

What is the Factorial of a Number?

The factorial of a number is the product of all the numbers from 1 to the given number.

Let's assume the number is 5 So the factorial of 5 will be:

1*2*3*4*5 = 120


Now, let's see what is the factorial of n numbers:

factorial of n(n!) = 1 * 2 * 3 * 4.....n

Now it's time to learn Different Ways of Finding the Factorial of a number in JavaScript:

Factorial of a Number in JavaScript using for Loop

function factorial(number) {
  if (number === 0 || number === 1) {
    return 1;
  }
  else {
    let result = 1;
    for (let i = 2; i <= number; i++) {
      result *= i;
    }
    return result;
  }
}

console.log(factorial(5));

// Output: 120

Find Factorial of a Number in HTML using JavaScript

<!DOCTYPE html>
<html>
<head>
    <title>Finding Factorial of a Number using JavaScript </title>
</head>
<body>
   
    <h2>Factorial Calculator</h2>
    <form>
        Enter a number:
        <input type="number" id="inputValue">
        <button type="button" onclick="FindFactorial()">Find</button>
    </form>
    <p id="outputArea"></p>

</body>
<script>
    function FindFactorial() {
        let number = parseInt(document.getElementById("inputValue").value);
        let result = 1;

        if (number === 0 || number === 1) {
            result = 1;
        }
        else {
            for (let i = 2; i <= number; i++) {
                result *= i;
            }
        }

        document.getElementById("outputArea").innerHTML = "Factorial of " + number + " is: " + result;
    }
</script>
</html>

Output:

Factorial Program in JavaScript using while Loop

function factorial(number) {
  if (number === 0 || number === 1) {
    return 1;
  }
  else {
    let result = 1;
    let i = 2;
    while (i <= number) {
      result *= i;
      i++;
    }
    return result;
  }
}

console.log(factorial(4));

// Output: 120

Factorial Program in JavaScript using Function

function factorial(number) {
  if (number === 0 || number === 1) {
    return 1;
  }
  else {
    return number * factorial(number - 1);
  }
}

console.log(factorial(5));

// Output: 120


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