ds-algo-study/DS-n-Algos/ALGO/UNSORTED/Recursion-factorial.js

Just experimenting with publishing a package

function fact(n){
    if (n>=1){ return n * fact(n-1)}
    else {return 1};
}
console.log(fact(3)); // 3*fact(2) = 3*2!=3*2*fact(1) = 3*2*fact(1)= 3*2*fact(0)=3*2*1
                     
//5!=5 * 4 * 3 * 2 * 1
//4!=4 * 3 * 2 * 1
//1!=1
//0!=1
//n!= n * (n-1) * (n-2) * ...*1
//(n-1)!= (n-1) * (n-2) * ..*1
//n! = n * (n-1)! } if n >= 1 , n! = 1 if n = 0