网站首页 返回列表像“草根”一样，紧贴着地面，低调的存在，冬去春来，枯荣无恙。

24. map字典测试用例（文字出现次数统计）

2020-06-10 03:04:07 admin 561

利用map实现字符串内文字出现次数的统计。  
编写一个测试用例，对文字计数函数的功能进行测试。  
测试通过，则打印文字出现次数的统计结果

package main
    
    import (
        "fmt"
        "strings"
    )
    //测试调用
    func Test(f func(string) map[string]int) {
        ok := true
        for _, c := range testCases {
            got := f(c.in)
            if len(c.want) != len(got) {
                ok = false
            } else {
                for k := range c.want {
                    if c.want[k] != got[k] {
                        ok = false
                    }
                }
            }
            if !ok {
                fmt.Printf("FAIL\n f(%q) =\n  %#v\n want:\n  %#v",
                    c.in, got, c.want)
                break
            }
            fmt.Printf("PASS\n f(%q) = \n  %#v\n", c.in, got)
        }
    }
    
    //测试用例
    var testCases = []struct {
        in   string
        want map[string]int
    }{
        {"I am learning Go!", map[string]int{
            "I": 1, "am": 1, "learning": 1, "Go!": 1,
        }},
        {"The quick brown fox jumped over the lazy dog.", map[string]int{
            "The":  1, "quick": 1, "brown": 1, "fox": 1, "jumped": 1,
            "over": 1, "the": 1, "lazy": 1, "dog.": 1,
        }},
        {"I ate a donut. Then I ate another donut.", map[string]int{
            "I": 2, "ate": 2, "a": 1, "donut.": 2, "Then": 1, "another": 1,
        }},
        {"A man a plan a canal panama.", map[string]int{
            "A": 1, "man": 1, "a": 2, "plan": 1, "canal": 1, "panama.": 1,
        }},
    }
    //文字出现次数统计
    func WordCount(s string) map[string]int {
        s0 := strings.Fields(s)
    
        s1 := make(map[string]int)
        for _, k := range s0 {
            _, ok := s1[k]
            if !ok {
                s1[k] = 1
            }else{
                s1[k] += 1
            }
        }
    
        return s1
        //return map[string]int{"x": 1}
    }
    
    func main() {
        Test(WordCount)
    }

WordCount实现文字次数统计  
s0是对原来句子中的文字建立切片  
s1是统计后的结果map，每个文字都是一个键  
运行效果

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

转载文章，原文链接： 24. map字典测试用例（文字出现次数统计）

关键字词map 测试用例

分享到：

上一篇：25. 函数值函数是函数也是值

下一篇：23. map字典的使用

如需留言，请登录，没有账号？请注册

0 条评论 0 人参与