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                合規國際互聯網加速 OSASE為企業客戶提供高速穩定SD-WAN國際加速解決方案。 廣告
                ## 一、map集合的聲明方式 ~~~ // 聲明變量,默認 map 是 nil var map_variable map[key_type]value_type // 使用 make 函數 map_variable := make(map[key_type]value_type) ~~~ **示例:** ~~~ package main import "fmt" func main() { var countries map[string]string countries = make(map[string]string) countries["France"] = "Paris" countries["Italy"] = "羅馬" countries["Japan"] = "東京" countries["India"] = "新德里" for country := range countries { fmt.Println(country, "首都是", countries[country]) } } ~~~ 結果: ~~~ France 首都是 Paris Italy 首都是 羅馬 Japan 首都是 東京 India 首都是 新德里 ~~~ ## 二、使用make生成map集合可以多傳一個容量參數,但由于map的特性(一旦容量不夠,會自動擴容),使得這個參數在使用的時候可忽略 ``` package main import "fmt" func main() { user := make(map[string]string, 3) user["name"] = "tom" user["gender"] = "male" user["favorite"] = "basketball" user["class"] = "one" user["love"] = "own" fmt.Print(user, len(user)) } ``` 結果:map[name:tom gender:male favorite:basketball class:one love:own] 5 ## 三、delete()刪除map集合中的元素 ~~~ delete(countries, "France") ~~~
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