How to Safely Check for Nil in Go Interfaces?

How to Check for Nil and Nil Interface in Go

In Go, checking for nil and nil interfaces is a common task. However, the current implementation of isNil function is not optimal.

The function reflect.ValueOf(a).IsNil() panics if the value's type is anything other than Chan, Func, Map, Ptr, Interface, or Slice. To avoid this panic, the isNil function includes a recover() mechanism.

Alternative Solution

Fortunately, there's a simpler and more efficient way to handle this check. As per the discussion on the golang-nuts mailing list, you can rely on a simple comparison against nil if you follow certain rules:

• Never store (*T) (nil) in an interface.
• Assigning untyped nil to an interface is always safe.

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