Map[key]value//结构
方法一:
m1 := map[string]string{//方法一 "name": "dog", "course": "golong", "site": "imooc", "quality": "not bad", } m2 := make(map[string]int)//方法二:初始为空 var m3 map[string]int//方法三:初始为空 fmt.Println(m1) fmt.Println(m2) fmt.Println(m3)
结果:
m1 := map[string]string{ "name": "dog", "course": "golong", "site": "imooc", "quality": "not bad", } fmt.Println("Map的遍历:") for k, v := range m1 { fmt.Println(k, v) }
结果:
m1 := map[string]string{ //方法一 "name": "dog", "course": "golong", "site": "imooc", "quality": "not bad", } fmt.Println("获取value:") courseName := m1["course"] fmt.Println(courseName)四.判断key值是否在map中
m1 := map[string]string{ //方法一 "name": "dog", "course": "golong", "site": "imooc", "quality": "not bad", } fmt.Println("获取value:") courseName, ok := m1["course"] fmt.Println(courseName, ok) causeName, ok := m1["cause"]//cause不在map中,输出值为空 fmt.Println(causeName, ok)
结果:
m1 := map[string]string{ //方法一 "name": "dog", "course": "golong", "site": "imooc", "quality": "not bad", } name, ok := m1["name"] fmt.Println(name, ok) delete(m1, "name") name, ok = m1["name"] fmt.Println(name, ok)
结果:
1. map使用哈希表,必须可以比较相等。
2. 除了slice、map、function的内建类型都可以作为key。
3. struct类型不包括上述字段,也可以作为key
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