go / beginner
Snippet
Error Handling with Multiple Return Values
Go uses multiple return values for error handling, a core design pattern. Functions return both a value and an error. The error is nil on success, otherwise it contains the error message. The `if err != nil` pattern is used throughout Go code.
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package mainimport ("errors""fmt")func divide(a, b int) (int, 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)}
Breakdown
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(int, error)
Function signature declares two return values: int and error
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errors.New("...")
Creates a new error with the given message string
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return a / b, nil
Returns result as first value, nil error as second for success case