4 ms·

> Two types of nil What in the javascript is this.

• mdaniel 1y ago
  I get bitten by the "nil interface" problem if I'm not paying a lot of attention since golang makes a distinction between the "enclosing type" and the "receiver type" package main import "fmt" type Foo struct{ Name string } func (f *Foo) Kaboom() { fmt.Printf("hello from Kaboom, f=%s\n", f.Name) } func NewKaboom() interface{ Kaboom() } { var p *Foo = nil return p } func main() { obj := NewKaboom() fmt.Printf("obj == nil? %v\n", obj == nil) // The next line will panic (because method receives nil *Foo) obj.Kaboom() } go run fred.go obj == nil? false panic: runtime error: invalid memory address or nil pointer dereference