What mechanisms and approaches are used in Golang for error handling?

In Go, error handling is based on returning an error value (of type error) from functions. Instead of exceptions, explicit error checks are used after calling a function.

Main approaches:

• Functions return two values: the result and an error error.
• The error is checked using if err != nil.
• Errors are created using errors.New or fmt.Errorf.
• For more complex handling, the errors packages (e.g., errors.Is, errors.As) can be used to check and wrap errors.

Example:

package main

import (
    "errors"
    "fmt"
)

func divide(a, b float64) (float64, error) {
    if b == 0 {
        return 0, errors.New("division by zero")
    }
    return a / b, nil
}

func main() {
    result, err := divide(10, 0)
    if err != nil {
        fmt.Println("Error:", err)
        return
    }
    fmt.Println("Result:", result)
}

Thus, Go encourages explicit and straightforward error handling without using exceptions.