Why is this javascript function returning undefined? [duplicate]

Question

Why is this function returning undefined? It has a value inside the function, but once I try to assign it to a new variable, it comes back as undefined.

function getLookupDefault(lookupModel) {
    Object.keys(lookupModel.LookupValues).forEach(function (key) {
        if (lookupModel.LookupValues[key].IsDefault == true) {
            test = lookupModel.LookupValues[key].Name;
            console.log("test: " + test);
            return test;
        }
    })
};

var tst = getLookupDefault(model.LookupValuesDelimiter);
console.log("tst: " + tst);

Edit: Thank you. Coming from c#, this was not obvious to me. I have edited the code to this and it works correctly.

function getLookupDefault(lookupModel) {
    for (var key in Object.keys(lookupModel.LookupValues)) {
        if (lookupModel.LookupValues[key].IsDefault == true) {
            test = lookupModel.LookupValues[key].Name;
            console.log("test: " + test);
            return test;
        }
    }
}

because it has no return statement in it - you also "return" in a .forEach callback, which is pointless, ... perhaps you wanted map instead — Jaromanda X
– Jaromanda X, Commented Mar 8, 2018 at 5:14
oh for goodness sake, remove the image, it adds nothing to the question — Jaromanda X
– Jaromanda X, Commented Mar 8, 2018 at 5:16
@ScottMarcus - yes, well spotted, but where is there a return in the getLookupDefault function? and returning a value from a forEach callback does nothing anyway — Jaromanda X
– Jaromanda X, Commented Mar 8, 2018 at 5:17

kshetline · Accepted Answer · 2018-03-08 05:16:54Z

1

That return statement you have in there doesn't return a value to the outer function, it only returns a value to the inner function called by forEach.

answered Mar 8, 2018 at 5:16

kshetline

14k6 gold badges49 silver badges96 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Jaromanda X Over a year ago

i.e. it's a star trek GNDN ... goes nowhere, does nothing

Collectives™ on Stack Overflow

Why is this javascript function returning undefined? [duplicate]

1 Answer 1

1 Comment

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Linked

Related