What is the Go error interface and how does it work?

What is the Go error interface and how does it work?

The Go error interface is a built-in interface that represents an error condition. It has a single method, Error(), which returns a string describing the error.

Can you give me an example of how to implement it?

Sure! Here's a simple example:

package main

import "fmt"

type MyError struct {
    Message string
}

func (e *MyError) Error() string {
    return e.Message
}

func doSomething() error {
    return &MyError{Message: "Something went wrong!"}
}

func main() {
    if err := doSomething(); err != nil {
        fmt.Println(err)
    }
}

What are some common practices when using the error interface?

Common practices include returning errors from functions, using wrapped errors for context, and checking for specific error types.

How do I handle multiple errors in Go?

You can handle multiple errors by collecting them in a slice and returning them together, or by using a custom error type that aggregates multiple errors.