刪除地圖元素

所述 delete 內建函式刪除與從地圖指定鍵的元素。

people := map[string]int{"john": 30, "jane": 29}
fmt.Println(people) // map[john:30 jane:29]

delete(people, "john")
fmt.Println(people) // map[jane:29]

如果 map 是 nil 或者沒有這樣的元素，則 delete 沒有效果。

people := map[string]int{"john": 30, "jane": 29}
fmt.Println(people) // map[john:30 jane:29]

delete(people, "notfound")
fmt.Println(people) // map[john:30 jane:29]

var something map[string]int
delete(something, "notfound") // no-op