Nil Safety

Route by Type

• Interface nil trap → see interface/
• Map nil writes → see map/
• Slice zero-value → see slice/
• Pointer receivers → see pointer/

Quick Check

• Check pointers before deref
• Check maps before write
• Typed nil != nil interface

Common Gotcha

var p *int
if p == nil {  // true
    fmt.Println("nil pointer")
}