javascriptAsync race conditionEasyDay 13 of 30

getName gives back undefined

Time: 0:00

BugFind the bug and fix the code

What it should do

getName(id) loads a user and gives back their name. Example: await getName(1) → "user1".

What happens instead

await getName(1) gives undefined.

const loadUser = async (id) => ({ id: id, name: "user" + id });

function getName(id) {
    return loadUser(id).then((user) => {
        user.name;
    });
}

Test a custom input to verify an edge case (e.g. empty lists, negative numbers, duplicates).

⏱️0:00

Hints

🏆 0 hints = Flawless Solve

Think & Test Cooldown

2:00 remaining

Take a moment to read the bug symptom and trace the code with Run & Check before unlocking Hint 1.

Hint 2

Unlocks after Hint 1

Hint 3

Unlocks after Hint 2

This bug belongs to the async and race conditions pattern

A missing await, results in the wrong order, and updates that overwrite each other under load.

Learn the async and race conditions pattern Step through your own code

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javascriptAsync race conditionEasyDay 13 of 30

getName gives back undefined

Time: 0:00

BugFind the bug and fix the code

What it should do

getName(id) loads a user and gives back their name. Example: await getName(1) → "user1".

What happens instead

await getName(1) gives undefined.

const loadUser = async (id) => ({ id: id, name: "user" + id });

function getName(id) {
    return loadUser(id).then((user) => {
        user.name;
    });
}

Test a custom input to verify an edge case (e.g. empty lists, negative numbers, duplicates).

⏱️0:00

Hints

🏆 0 hints = Flawless Solve

Think & Test Cooldown

2:00 remaining

Take a moment to read the bug symptom and trace the code with Run & Check before unlocking Hint 1.

Hint 2

Unlocks after Hint 1

Hint 3

Unlocks after Hint 2

This bug belongs to the async and race conditions pattern

A missing await, results in the wrong order, and updates that overwrite each other under load.

Learn the async and race conditions pattern Step through your own code

getName gives back undefined

What it should do

What happens instead

More async and race conditions to practise

Related errors

getName gives back undefined

What it should do

What happens instead

More async and race conditions to practise

Related errors