Wordcount implementation on Google's GO

wordcount.go

package main

import (
	"strings"
	"tour/wc"
)

func WordCount(s string) map[string]int {
	var counts = make(map[string]int)
	for _, w := range strings.Fields(s) {
		counts[w]++
	}
	return counts
}

func main() {
	wc.Test(WordCount)
}

WordcountTest.go

http://tour.golang.org/#44

PASS
 f("I am learning Go!") = 
  map[string]int{"am":1, "I":1, "learning":1, "Go!":1}
PASS
 f("The quick brown fox jumped over the lazy dog.") = 
  map[string]int{"jumped":1, "lazy":1, "dog.":1, "brown":1, "over":1, "the":1, "fox":1, "quick":1, "The":1}
PASS
 f("I ate a donut. Then I ate another donut.") = 
  map[string]int{"a":1, "I":2, "another":1, "ate":2, "donut.":2, "Then":1}
PASS
 f("A man a plan a canal panama.") = 
  map[string]int{"man":1, "plan":1, "canal":1, "a":2, "A":1, "panama.":1}