Go语言学习笔记-A Tour of Go 练习笔记-Maps

Exercise: Maps

题目：

Implement WordCount. It should return a map of the counts of each “word” in the string s. The wc.Test function runs a test suite against the provided function and prints success or failure.

You might find strings.Fields helpful.

练习程序：

package main
 
import (
	"golang.org/x/tour/wc"
	"strings"
)
 
var string_count_map map[string]int
 
func WordCount(s string) map[string]int {
 
    string_count_map = make(map[string]int)
	
	string_count := strings.Fields(s)
	for _, j := range string_count{
		ok := false
	    _, ok = string_count_map[j]
		if ok{
		    string_count_map[j] += 1
		}else{
		    string_count_map[j] = 1
		}
	}
	return string_count_map
}
 
func main() {
	wc.Test(WordCount)
}

运行结果：

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

笔记：该题目旨在通过Maps的创建和赋值，从而实现对String中单词的计数功能，通过利用string.Fields将一个字符串进行切分，得到单词slice, 讲该slice中的每个单词作为map的key值进行赋值，而map的value则根据单词出现的次数进行自增+1计数。