goLogic errorEasy

Slice bounds out of range panic on short string

Time: 0:00

BugFind the bug and fix the code

What it should do

Safely slice the first 6 characters or return the full string if shorter. Example: parseHexPrefix("abcd") -> "abcd"

What happens instead

panic: runtime error: slice bounds out of range [:6] with length 4

package main

import "fmt"

func parseHexPrefix(hex string) string {
	// Directly slices first 6 without guarding length
	return hex[:6]
}

func main() {
	fmt.Println(parseHexPrefix("abcd"))
}

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 logic errors pattern

The wrong operator, an inverted condition, a formula the right way round but backwards.

Learn the logic errors pattern Step through your own code

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goLogic errorEasy

Slice bounds out of range panic on short string

Time: 0:00

BugFind the bug and fix the code

What it should do

Safely slice the first 6 characters or return the full string if shorter. Example: parseHexPrefix("abcd") -> "abcd"

What happens instead

panic: runtime error: slice bounds out of range [:6] with length 4

package main

import "fmt"

func parseHexPrefix(hex string) string {
	// Directly slices first 6 without guarding length
	return hex[:6]
}

func main() {
	fmt.Println(parseHexPrefix("abcd"))
}

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 logic errors pattern

The wrong operator, an inverted condition, a formula the right way round but backwards.

Learn the logic errors pattern Step through your own code

Slice bounds out of range panic on short string

What it should do

What happens instead

More logic errors to practise

Slice bounds out of range panic on short string

What it should do

What happens instead

More logic errors to practise