A struct literal denotes a newly allocated struct value by listing the values of its fields. You can list just a subset of fields by using the Name: syntax. (And the order of named fields is irrelevant.) The special prefix & returns a pointer to the struct value.
var (
z1 = xy{1, 2} // has type xy. z1={1,2}
z2 = xy{X: 1} // Y:0 is implicit z2={1,0}
z3 = xy{} // X:0 and Y:0 z3={0,0}
p = &xy{1, 2} // has type *xy p={1,2}
)
package main
import "fmt"
type xy struct {
X, Y int
}
var (
z1 = xy{1, 2} // has type xy
z2 = xy{X: 1} // Y:0 is implicit
z3 = xy{} // X:0 and Y:0
p = &xy{1, 2} // has type *xy
)
func main() {
fmt.Println(z1, p, z2, z3)
}