// Chapter 28 example: range gives a copy of each struct. The first loop only
// changes the copies. The second loop uses the position, and changes the slice.
// Run with: go run exercises/28/02-range-copy.go

package main

import "fmt"

type critter struct {
	name   string
	energy int
}

func (c *critter) play() {
	c.energy = c.energy - 1
	fmt.Printf("%s plays. Energy: %d\n", c.name, c.energy)
}

func main() {
	critters := []critter{
		{name: "Spark", energy: 3},
		{name: "Bolt", energy: 2},
	}

	for _, c := range critters {
		c.play()
	}
	fmt.Println(critters) // [{Spark 3} {Bolt 2}]

	for i := range critters {
		critters[i].play()
	}
	fmt.Println(critters) // [{Spark 2} {Bolt 1}]
}