JavaScript: Calculate the factorial of a number

JavaScript Function: Exercise-1 with Solution

Write a JavaScript program to calculate the factorial of a number.

In mathematics, the factorial of a non-negative integer n, denoted by n!, is the product of all positive integers less than or equal to n. For example, 5! = 5 x 4 x 3 x 2 x 1 = 120

Pictorial Presentation:

JavaScript: Calculate the factorial of a number

Sample Solution:-

HTML Code:

<!DOCTYPE html>
<meta charset=utf-8 />
<title>Calculate the factorial of a number.</title>

JavaScript Code:

function factorial(x) 

  if (x === 0)
    return 1;
  return x * factorial(x-1);




Flowchart: JavaScript recursion function- Calculate the factorial of a number

Live Demo:

See the Pen javascript-recursion-function-exercise-1 by w3resource (@w3resource) on CodePen.

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Next: Write a JavaScript program to find the greatest common divisor (gcd) of two positive numbers.

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JavaScript: Tips of the Day

Creates an object from the given key-value pairs


const tips_objectFromPairs = arr => arr.reduce((a, [key, val]) => ((a[key] = val), a), {});
console.log(tips_objectFromPairs([['x', 2], ['y', 4]])); 


[object Object] {
  x: 2,
  y: 4