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package main
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import (
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"fmt"
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"math/rand"
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"sort"
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)
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func main() {
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myMap := make(map[string]int)
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myMap["song"] = 1
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myMap["zhang"] = 2
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fmt.Println(myMap)
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myMap2 := map[string]string{
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"123": "123",
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"456": "456",
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}
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fmt.Println(myMap2)
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key, value := IsExist()
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if value {
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fmt.Printf("%v\n", key)
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} else {
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fmt.Printf("查无此人: %v\n", key)
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}
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RangeMap()
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DeleteKey("003")
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RangeMap2()
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MapSlice()
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SliceMap()
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}
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// IsExist 键是否存在
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func IsExist() (int, bool) {
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fmt.Println("===IsExist===")
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mMap := make(map[string]int) //map类型的变量默认初始值为nil，需要使用make()函数来分配内存
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mMap["张三"] = 333
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mMap["李四"] = 444
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v, ok := mMap["张三"]
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return v, ok
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}
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// RangeMap 遍历
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func RangeMap() {
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fmt.Println("===RangeMap===")
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rMap := map[string]string{
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"001": "张三",
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"002": "李四",
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"003": "王五",
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"004": "周六",
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}
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for k, v := range rMap {
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fmt.Println(k, v)
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}
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fmt.Println("range key")
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for rk := range rMap {
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fmt.Println(rk)
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}
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}
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// DeleteKey 删除键
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func DeleteKey(key string) {
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fmt.Println("===DeleteMap===")
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dMap := map[string]string{
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"001": "张三",
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"002": "李四",
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"003": "王五",
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"004": "周六",
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}
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delete(dMap, key)
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for k, v := range dMap {
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fmt.Println(k, v)
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}
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}
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// RangeMap2 指定顺序遍历
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func RangeMap2() {
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fmt.Println("===RangeMap2===")
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scoreMap := make(map[string]int, 200)
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for i := 0; i < 20; i++ {
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key := fmt.Sprintf("stu%02d", i)
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value := rand.Intn(100)
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scoreMap[key] = value
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}
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//fmt.Println(scoreMap)
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//将key存入切片
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keys := make([]string, 0, 200)
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fmt.Println("排序前")
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for key := range scoreMap {
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keys = append(keys, key)
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fmt.Printf("%v: %v ", key, scoreMap[key])
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}
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sort.Strings(keys)
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fmt.Println("\n排序后")
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//for i := 0; i < len(keys); i++ {
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// fmt.Printf("%v ", scoreMap[keys[i]])
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//}
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for _, key := range keys {
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fmt.Printf("%v: %v ", key, scoreMap[key])
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}
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fmt.Println()
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}
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// MapSlice 元素为map类型的切片
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func MapSlice() {
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fmt.Println("===元素为map类型的切片===")
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//先申明并初始化一个map“切片”
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mapSlice := make([]map[string]string, 3)
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for index, value := range mapSlice {
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fmt.Printf("index: %v, value: %v\n", index, value)
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}
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//在对切片中的map进行初始化
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mapSlice[0] = make(map[string]string, 10)
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mapSlice[0]["name"] = "swansong"
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mapSlice[0]["age"] = "22"
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mapSlice[0]["sex"] = "man"
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for index, value := range mapSlice {
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fmt.Printf("index: %v, value:%v\n", index, value)
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}
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}
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// SliceMap 值为切片类型的map
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func SliceMap() {
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fmt.Println("===值为切片的map===")
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sliceMap := make(map[string][]string, 3)
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//for index, value := range sliceMap {
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// fmt.Printf("index: %v, value: %v", index, value)
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//}
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fmt.Println(sliceMap)
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key := "中国"
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value, ok := sliceMap[key]
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if !ok {
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value = make([]string, 0, 2)
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}
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value = append(value, "北京", "上海")
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sliceMap[key] = value
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fmt.Println(sliceMap)
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}
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