[A Tour of Go] Exercise: Mapsの自分の解答

package main

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

func WordCount(s string) map[string]int {
    words := make(map[string]int)
    var wordstorage string
    for i:=0; i < len(s); i++ {
        if s[i:i+1] == " " {
            words[wordstorage] += 1
            wordstorage = ""
        } else {
            wordstorage += s[i:i+1]
        }
    }
    words[wordstorage] += 1
    return words
}

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