You cannot assign a struct field off map directly in golang

published on 2013/08/29
Code 
package main
import “fmt”
var m = map[string]struct{x, y int} {
	“foo”: {2, 3},
}
func main() {
	m[“foo”].x = 4 // cannot assign to m[“foo”].x
	fmt.Println(m)
}

Here’s above snippet at Go Playground

package main
import “fmt”
var m = map[string]*struct{x, y int} {
	“foo”: {2, 3},
}
func main() {
	m[“foo”].x = 4
	fmt.Println(m[“foo”].x)
}

You can check above snippet at Go Playground

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