A brief analysis of how golang handles errors (error)

Golang is a compiled, concurrent, and garbage-collected programming language. One of the best features of Golang is that it has a built-in standard library that defines error types. Therefore, Golang uses errors extensively to express error information in function return values.

In Golang, all errors are of type error. The error type is a built-in interface that implements an Error() method. In Golang, multiple return values ​​are often used to avoid the need for each function to create its own error type and reduce code duplication.

In some cases, we need to customize errors. Errors can be customized in Golang by implementing the error interface. To implement the error interface, you only need to implement an Error() function, which returns a string type error message.

The following is a sample code that demonstrates how to define and use errors in Golang:

package main

import (
    "errors"
    "fmt"
)

func division(a, b int) (int, error) {
    if b == 0 {
        return 0, errors.New("division by zero")
    }
    return a / b, nil
}

func main() {
    result, err := division(10, 0)
    if err != nil {
        fmt.Println(err)
    } else {
        fmt.Println(result)
    }
}

In the above sample code, the division() function is used to calculate the division of two integers, Also check if the second parameter is 0. If the second parameter is 0, the function returns 0 and a custom error: "division by zero". In the main() function, we call the division() function and check the returned error. If err is not empty, an error has occurred.

The error type in Golang is very useful in error handling. Handling errors correctly can help us write more robust code. When writing code in Golang, make sure to always consider error handling and write proper error checking code to ensure that our program runs properly.

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