goScope errorMedium

Shadowed variable inside if statement block

Time: 0:00

BugFind the bug and fix the code

What it should do

Update status if valid and return final status. Example: fetchServerStatus(true) -> "ONLINE"

What happens instead

Function returns "OFFLINE" even when condition is true

package main

import "fmt"

func fetchServerStatus(isValid bool) string {
	status := "OFFLINE"
	if isValid {
		status := "ONLINE"
		_ = status
	}
	return status
}

func main() {
	fmt.Println(fetchServerStatus(true))
}

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

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This bug belongs to the scope and closure bugs pattern

Every callback reports the last value, a counter never increments, UnboundLocalError on a variable you can see.

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package main import "fmt" func fetchServerStatus(isValid bool) string { status := "OFFLINE" if isValid { status := "ONLINE" _ = status } return status } func main() { fmt.Println(fetchServerStatus(true)) }

Shadowed variable inside if statement block

What it should do

What happens instead

More scope and closure bugs to practise

Shadowed variable inside if statement block

What it should do

What happens instead

More scope and closure bugs to practise