What are some examples of error handling in Go?

What are some examples of error handling in Go?

In Go, error handling is done using the built-in error type. For example, you can return an error from a function like this:

func divide(a, b int) (int, error) {
    if b == 0 {
        return 0, fmt.Errorf("cannot divide by zero")
    }
    return a / b, nil
}

This function checks if the divisor is zero and returns an error if it is.

Can you show me how to handle multiple errors?

Certainly! You can handle multiple errors by checking each operation separately. Here's an example:

func readFile(filename string) error {
    file, err := os.Open(filename)
    if err != nil {
        return fmt.Errorf("failed to open file: %w", err)
    }
    defer file.Close()

    // Additional operations...
    return nil
}

In this case, if opening the file fails, it returns an error with context.

What about using panic and recover?

Panic and recover are used for handling unexpected errors. Here's a simple example:

func riskyFunction() {
    defer func() {
        if r := recover(); r != nil {
            fmt.Println("Recovered from panic:", r)
        }
    }()
    panic("something went wrong")
}

This will recover from the panic and allow the program to continue.