const bar = (num) => {
if (num < 2) {
return 1;
}
return num * bar(num-1);
}
How i can solved this? there are two side provide in question : input number and expected result. From this data, we can analize => this function has a stopper and pattern.
x | pattern | expected result | stopper ?
0 –> 0 = 1 (because 0 < 2) —> this is stopper
1 –> 1 = 1 (because 1 < 2) —> this is stopper
2 –> 2 * 1 = 2
3 –> 3 * 2 * 1 = 6
5 –> 5 * 4 * 3 * 2 * 1 = 120
so, the general pattern :
x >= 2 :::: x * (x-1) * (x-2) * …. * 1
x < 2 :::: 1
Thank you.
