goType errorMedium

Increment method fails to update struct value as expected

Time: 0:00

BugFind the bug and fix the code

What it should do

Increment the value of a Counter struct by 1. Example: increment(c) -> c.value should be incremented by 1.

What happens instead

The value of the Counter struct does not change after calling the increment method.

package main

type Counter struct {
	value int
}

func (c Counter) increment() {
	c.value += 1
}

func main() {
	c := Counter{value: 0}
	c.increment()
	println(c.value) // Expected: 1, Actual: 0
}

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

⏱️0:00

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Hint 2

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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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goType errorMedium

Increment method fails to update struct value as expected

Time: 0:00

BugFind the bug and fix the code

What it should do

Increment the value of a Counter struct by 1. Example: increment(c) -> c.value should be incremented by 1.

What happens instead

The value of the Counter struct does not change after calling the increment method.

package main

type Counter struct {
	value int
}

func (c Counter) increment() {
	c.value += 1
}

func main() {
	c := Counter{value: 0}
	c.increment()
	println(c.value) // Expected: 1, Actual: 0
}

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

Increment method fails to update struct value as expected

What it should do

What happens instead

More type errors to practise

Increment method fails to update struct value as expected

What it should do

What happens instead

More type errors to practise