Go handles errors by returning them as a second value that callers must explicitly check before proceeding.
Go handles errors by returning them as a second value from functions, which you must explicitly check with an if statement. This pattern forces the caller to decide how to handle the failure rather than using exceptions.
file, err := os.Open("filename.txt")
if err != nil {
log.Fatal(err)
}
// Use file
file.Close()
In Go, functions tell you if something went wrong by giving you two results: the data you wanted and an error message. You must check that error message before using the data, just like checking if a door is locked before trying to open it. This ensures your program never crashes unexpectedly because it always knows when a step failed.