Find Factorial using JavaScript Recursive function - JavaScript Tutorial 67

Published: 03 January 2018
on channel: ChidresTechTutorials

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Notes for You:: Find Factorial using JavaScript Recursive function - JavaScript Tutorial 67
Recursive function in JavaScript.
A function calling itself is called as a recursive function.

Example:
function f( )
{
…..
f( ); // calling a function inside its own body
}

Problem:
Write JavaScript program to find the factorial of a given number

Logic:
5! = 5 x 4 x 3 x 2 x 1 = 5 * (5-1)!
4! = 4 x 3 x 2 x 1 = 4 * (4-1)!
3! = 3 x 2 x 1 = 3 * (3-1)!
2! = 2 x 1 = 2 * (2-1)!
1! = 1

Observations:
a) Recursive behavior: n! = n * (n -1)!
b) Base condition: 1! = 1

Solution: Using recursive function

Code:
function fact(n)
{
if(n==1)
return 1;
else
return n * fact(n-1);
}

var rValue = fact(3);
document.write(rValue); // 6

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