Go Tour Exercise on Maps - http://tour.golang.org/moretypes/19

exercise-maps.go

package main

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

func WordCount(s string) map[string]int {
	m := make(map[string]int)
	words := strings.Fields(s)
	for _,val := range words {
		m[val] += 1
	}
	return m
}

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