Every variable in golang has a scope, without noticing it there will make some errors that can not be easily found. Let the code below illustrates it clearly:
func main() {
dt := "20220113"
if true {
dt, _ := strconv.Atoi("20220114")
fmt.Printf("inside if, dt: %v\n", dt)
}
fmt.Printf("outside if, dt: %v\n", dt)
}
we will get the output as below:
inside if, dt: 20220114
outside if, dt: 20220113
as you can see, the variable dt inside of if shields the outside variable with same name.
