Recursive function is not working properly-CodePudding

I created recursive function like so.

function countDown(count){
    if(count==0){
        return;
    }
   countDown(count-1)
}

console.log(countDown(5))

The function returns undefined insted of printing numbers from 5 to 1.What i did wrong?

CodePudding user response：

you return nothing, so it's clear it will be undefined.

function countDown(count){
    if(count==0){
        // you should return a value if you want value instead of undefined
        return 100;
    }
   countDown(count-1)
}

console.log(countDown(5))

CodePudding user response：

Consider your code:

function countDown(count){
    if(count==0){
        return;
    }
   countDown(count-1)
}

If your variable named "count" is equal to zero it returns nothing.

Hence, undefined.

If your intention is to print numbers 5 - 1. Change your code like so:

function countDown(count){
    if(count==0){
        return;
    }

console.log(count);
   countDown(count-1)
}

countDown(5);

CodePudding user response：

You need ot print inside of the function.

function countDown(count) {
    if (!count) return;
    console.log(count);
    countDown(count - 1);
}

countDown(5);