What challenges have you faced and how did you solve them?

In working with Go, I often encountered challenges related to:

• Concurrency management: solved using goroutines, channels, and the sync package (Mutex, WaitGroup) for synchronization.
• Error handling: used the error return pattern and wrapped errors with fmt.Errorf for context.
• Working with HTTP: used the standard net/http package, created middleware for logging and authentication.
• Working with databases: used database/sql with drivers, wrapped queries in transactions, used context for timeouts.

Example of solving a concurrency issue with a map:

var mu sync.Mutex
var cache = make(map[string]string)

func GetValue(key string) string {
    mu.Lock()
    defer mu.Unlock()
    return cache[key]
}

This approach prevents data races during parallel access.