javascriptType errorEasyDay 14 of 30

Cart total shows "01020" instead of 30

Time: 0:00

BugFind the bug and fix the code

What it should do

calculateTotal(items) adds up item.price for every item. The prices arrive as text, like "10". Example: prices "10" and "20" → 30.

What happens instead

calculateTotal([{ price: "10" }, { price: "20" }]) returns "01020".

function calculateTotal(items) {
    let total = 0;
    for (const item of items) {
        total += item.price;
    }
    return total;
}

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

⏱️0:00

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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 type errors pattern

Totals that concatenate, sorts that put 10 before 9, comparisons that refuse to run.

Learn the type errors pattern Step through your own code

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javascriptType errorEasyDay 14 of 30

Cart total shows "01020" instead of 30

Time: 0:00

BugFind the bug and fix the code

What it should do

calculateTotal(items) adds up item.price for every item. The prices arrive as text, like "10". Example: prices "10" and "20" → 30.

What happens instead

calculateTotal([{ price: "10" }, { price: "20" }]) returns "01020".

function calculateTotal(items) {
    let total = 0;
    for (const item of items) {
        total += item.price;
    }
    return total;
}

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 type errors pattern

Totals that concatenate, sorts that put 10 before 9, comparisons that refuse to run.

Learn the type errors pattern Step through your own code

Cart total shows "01020" instead of 30

What it should do

What happens instead

More type errors to practise

Related errors

Cart total shows "01020" instead of 30

What it should do

What happens instead

More type errors to practise

Related errors