go-learning/2moretypes/range.go
2023-07-12 16:04:57 +03:00

39 lines
1 KiB
Go

package main
import (
"fmt"
"reflect"
)
func main() {
fmt.Println("Range form of the for loof iterates over a slice or map")
fmt.Println("When ranging over a slice, two values are returned for each iteration. The first is the index, and the second is a copy of the element at that index")
var primes = []int{2, 3, 5, 7, 11, 13, 17}
fmt.Printf("%p, %p, %p, %p\n", &primes, primes, &primes[0], &primes[1])
fmt.Printf("%s, %s, %s\n\n", reflect.TypeOf(primes).Kind(), reflect.TypeOf(&primes).Kind(), reflect.TypeOf(&primes[0]).Kind())
for i, v := range primes {
fmt.Printf("%d: %d\n", i, v)
fmt.Printf("POINTER: %p\n\n", &v) // v is just a copy !!!
v = 10 // This line has NO impact
}
fmt.Println(primes)
fmt.Printf("\n\n")
fmt.Println("You can skip the index OR value by assigning to _")
// for i, _ := range varname
// for _, value := range varname
pow := make([]int, 10)
for i := range pow { // i is INDEX here! not value of pow!!!
pow[i] = 1 << i
}
for _, value := range pow {
fmt.Printf("%d\n", value)
}
}