A Tour of Go: Exercise Maps, https://go-tour-jp.appspot.com/moretypes/23

exercise-maps.go

package main

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

func WordCount(s string) map[string]int {
	words := strings.Fields(s)
	wordsCount := make(map[string]int)
	for i := 0; i < len(words); i++ {
		wordsCount[words[i]]++
	}
	return wordsCount
}

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

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{"quick":1, "fox":1, "jumped":1, "over":1, "lazy":1, "The":1, "the":1, "dog.":1, "brown":1}
PASS
 f("I ate a donut. Then I ate another donut.") = 
  map[string]int{"another":1, "I":2, "ate":2, "a":1, "donut.":2, "Then":1}
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.