Error Handling: Go's Multi-Return Value Approach

Wed, 25 Feb 2026 10:00:00 +0800

Go’s error handling philosophy is “simple, explicit, controllable.” Every function that can fail can return an error value, and the caller must explicitly handle it. No exceptions, no implicit propagation—everything is in plain sight.

The error Interface: One Value, One Method

Go’s error interface is minimal: just one Error() string method.

go


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type error interface {
 Error() string
}

This means any type that implements Error() string is an error. The Go standard library provides many built-in error types, most commonly errors.New and fmt.Errorf.

Error on Mi&Bee Blog

Error Handling: Go's Multi-Return Value Approach

The error Interface: One Value, One Method