search input by filter method

Question

I made a search input by using filter method but there is a warning with this. What was wrong?

Code picture

Answer 1

You have cases in which you don't return anything.

if (conditionA){
    return ...;
} else if (confitionB) {
    return ...;
}
// Nothing gets returned

You should add a return at the end of your function for when coditionA and coditionB are both false