goAsync race conditionMedium

Unexpected Result from Resource Cleanup in Go Function

Time: 0:00

BugFind the bug and fix the code

What it should do

Process data and ensure proper resource cleanup. Example: processDataWithCleanup(data) -> processedData

What happens instead

The returned processed data is incorrect or missing expected values.

package main 

import (
	"fmt"
	"os"
)

func processDataWithCleanup(data string) (result string) {
	file, err := os.Create("temp.txt")
	if err!= nil {
		return "Error creating file"
	}
	defer file.Close()
	
	if _, err := file.WriteString(data); err!= nil {
		result = "Error writing to file"
	}
	
	result = "Data processed successfully"
	return
}

func main() {
	fmt.Println(processDataWithCleanup("Sample data"))
}

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 async and race conditions pattern

A missing await, unbuffered channel deadlocks, ConcurrentModificationException, and data races under load.

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package main import ( "fmt" "os" ) func processDataWithCleanup(data string) (result string) { file, err := os.Create("temp.txt") if err!= nil { return "Error creating file" } defer file.Close() if _, err := file.WriteString(data); err!= nil { result = "Error writing to file" } result = "Data processed successfully" return } func main() { fmt.Println(processDataWithCleanup("Sample data")) }

Unexpected Result from Resource Cleanup in Go Function

What it should do

What happens instead

More async and race conditions to practise

Unexpected Result from Resource Cleanup in Go Function

What it should do

What happens instead

More async and race conditions to practise