Is Comparing Interfaces to `nil` in Go Reliable, and If So, How?

Checking for Nil and Nil Interfaces in Go

Determining if an interface is nil can be a common task in Go. However, using the provided helper function to achieve this raises concerns about panicking when the interface's Kind is not supported by the reflection.

Is There a Better Approach?

Kyle's response in the golang-nuts mailing list provides a valuable insight. He suggests that comparing an interface against nil is reliable if you strictly adhere to the principle of never storing (*T)(nil) in an interface. Conversely, assigning untyped nil to an interface is acceptable. This approach eliminates the need for reflection and potential panics.

By following this guideline, you can avoid the need for complex helper functions and simplify your code's nil checking logic.

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