String in Golang has immutability, which means modifying a string value will allocate a new space for the new value, not occupying the original space and updating its memory. Let's see an example,
package main
import "fmt"
type printer interface {
print()
}
type user struct {
name string
}
func (u user) print() {
fmt.Println(u.name)
}
func main() {
u := user{"tom"}
s := []printer{
u,
&u,
}
u.name = "new"
for _, item := range s {
item.print()
}
}
and the output,
tom
new
u.name is assigned a new value, the index zero of s is value type, it's a copy of original u, with name pointing to tom, when u.name is modified, this copy will not change, the original u has been modified to new.
