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)
	}

}