https://tour.golang.org/moretypes/23

exercise-maps.go

package main

import (
	"golang.org/x/tour/wc"
	"strings"
)

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

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