http://go-tour-jp.appspot.com/#41

go-tour-41.go

package main

import (
	"code.google.com/p/go-tour/wc"
	"strings"
)

func WordCount(s string) map[string]int {
	wc := make(map[string]int)
	words := strings.Fields(s)
	// words = strings.Split(s, " ")
	for _, word := range words {
		wc[word] += 1
	}

	return wc
}

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

test-result

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

Program exited.