rd-Data-Structures-Algorithm-in-JavaScript/Factorial.js at master · ReddyDivya/rd-Data-Structures-Algorithm-in-JavaScript · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
/*
Factorial
Factorial(5) => 5*4*3*2*1 = 120
*/
const Factorial = (num) => {

    if(num === 0 || num === 1) return 1;

    let result = 1;

    for(let i=num; i > 0; i--)
    {
        result = result * i;
    }

    return result;
}

console.log("1. using for loop ");
console.log(Factorial(0));//1
console.log(Factorial(1));//1
console.log(Factorial(5));//120
console.log(Factorial(7));//5040
console.log("----------");

//2. Using recursion
const Factorial2 = (num) => {
    if(num === 0 || num === 1) return 1;

    let result = 1;
    result = num * Factorial2(num - 1);

    return result;
}

console.log("2. Using Recursion");
console.log(Factorial(0));//1
console.log(Factorial(1));//1
console.log(Factorial2(5));//120
console.log(Factorial2(7));//5040