Check for nil and nil interface in Go

Question

Currently I\'m using this helper function to check for nil and nil interfaces

func isNil(a interface{}) bool {
  defer func() { recover() }()
  return a == n         


        

Answer 1

See for example Kyle's answer in this thread at the golang-nuts mailing list.

In short: If you never store (*T)(nil) in an interface, then you can reliably use comparison against nil, no need to use reflection. On the other hand, assigning untyped nil to an interface is always OK.