CODEWITHSUNDEEP
javascriptrecursionreturn
Hedge
Hedge

Reputation: 16748

Return value of recursive function is 'undefined'

Whenever I execute this snippet the console.log before return returns the array with 20 times the value 23. However console.log(Check(users, 0, 20)); returns only 'undefined'.

What am I doing wrong?

var users = [23, 23, 23, 23, 23, 23, 23, 23, 23, 23];
console.log(Check(users, 0, 20));

function Check(ids, counter, limit){
    ids.push(23);

    // Recursion
    if (counter+1 < limit){
        Check(ids, counter+1, limit);
    }
    else {
        console.log(ids);
        return ids;
    }
}

Upvotes: 22

Views: 16736

Answers (1)

Olegas
Olegas

Reputation: 10507

You forgot to return a result from the point, where you entering recusrion.

var users = [23, 23, 23, 23, 23, 23, 23, 23, 23, 23];
console.log(Check(users, 0, 20));

function Check(ids, counter, limit){
    ids.push(23);

    // Recursion
    if (counter+1 < limit){
        return Check(ids, counter+1, limit); // return here!
    }
    else {
        console.log(ids);
        return ids;
    }
}

But return value seems useless, cause' your function altering initial array as well.

Upvotes: 44

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