golang len return type
int32
golang copy struct
type Person struct{
Name string
Age int
}
alice1 := Person{"Alice", 30}
alice2 := alice1
fmt.Println(alice1 == alice2) // => true, they have the same field values
fmt.Println(&alice1 == &alice2) // => false, they have different addresses
alice2.Age += 10
fmt.Println(alice1 == alice2) // => false, now they have different field values
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