Compare Trees.go

package main

import "golang.org/x/tour/tree"
import "fmt"

// Walk walks the tree t sending all values
// from the tree to the channel ch.
func _walk(t *tree.Tree, ch chan int) {
	if t.Left != nil { _walk(t.Left, ch) }
	ch <- t.Value
	if t.Right != nil { _walk(t.Right, ch) }
}
func Walk(t *tree.Tree, ch chan int) {
	_walk(t, ch)
	close(ch)
}

// Same determines whether the trees
// t1 and t2 contain the same values.
func Same(t1, t2 *tree.Tree) bool {
	ch1, ch2 := make(chan int), make(chan int)
	go Walk(t1, ch1)
	go Walk(t2, ch2)
	for val := range ch1 {
		if val != <- ch2 {
			return false
		}
	}
	return true
}

func main() {
	t1 := tree.New(1)
	t2 := tree.New(1)
	fmt.Println(Same(t1, t2))
	fmt.Println(Same(t1, tree.New(2)))
}