package main

import "fmt"

var pow = []int{1, 2, 4, 8, 16, 32, 64, 128}

var persons = []Person {
	{"Miguel", "Fermin"},
	{"Ana", "Concepcion"},
	{"Noah", "Fermin"},
	{"Milady", "Perez"},
	{"Hailey", "Diaz"},
}

func main() {
	// The range form of the for loop iterates over a slice or map.
	// 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.
	for i, v := range pow {
		fmt.Printf("2**%d = %d\n", i, v)
	}

	// You can skip the index or value by assigning to _.
	fmt.Println()
	for _, person := range persons {
		fmt.Printf("person: %v\n", person.name())
	}

	// If you only want the index, drop the ", value" entirely.
	fmt.Println()
	for index, _ := range persons {
		fmt.Printf("index: %v\n", index)
	}
	fmt.Println()
}

// Supporting Types

type Person struct {
	firstName, lastName string
}

func (p Person) name() string {
	return fmt.Sprintf("%v %v", p.firstName, p.lastName)
}