mutating-a-slice-in-struct

package main
 
import "fmt"
 
type Bar struct {
	Bar string
}
 
type Bars []Bar
 
type Foo struct {
	Bars Bars
}
 
func main() {
	f := Foo{Bars: []Bar{{Bar: "ege"}}}
	fmt.Printf("Foo: %+v\n", f)
	for _, e := range f.Bars {
		e.Bar = "gule"
	}
	fmt.Printf("Foo: %+v\n", f)
 
	f = Foo{Bars: []Bar{{Bar: "ege"}}}
	fmt.Printf("Foo: %+v\n", f)
	for i, _ := range f.Bars {
		x := &f.Bars[i]
		x.Bar = "gule"
	}
	fmt.Printf("Foo: %+v\n", f)
}

Foo: {Bars:[{Bar:ege}]}
Foo: {Bars:[{Bar:ege}]}
Foo: {Bars:[{Bar:ege}]}
Foo: {Bars:[{Bar:gule}]}