英文:
maps - deleting data
问题
如何在Go中从map中删除数据？例如，有以下map：
m := map[string]string{ "key1":"val1", "key2":"val2" };
我想让m删除"key1"，而不是通过迭代其键（在某些情况下可能很大）来复制整个map。将nil值分配给"key1"是否足够，或者它仍然会保留具有nil值的键在map结构中？也就是说，如果我稍后迭代map的键，"key1"会出现吗？
英文:
How does one delete data from a map in Go? For example, having
m := map[string]string{ "key1":"val1", "key2":"val2" };
I want to make m drop the "key1" without copying the entire map by iterating over its keys (which could get big in some uses). Is it enough to assign a nil value to "key1", or will that still keep the key in the map structure with an assigned value of nil? That is, if I later iterate over the keys of the map, will "key1" appear?
答案1
得分: 53
> 删除map元素
>
> 内置函数delete从map m中删除具有键k的元素。
>
> delete(m, k) // 从map m中删除元素m[k]
例如，
package main
import "fmt"
func main() {
m := map[string]string{"key1": "val1", "key2": "val2"}
fmt.Println(m)
delete(m, "key1")
fmt.Println(m)
}
输出：
map[key1:val1 key2:val2]
map[key2:val2]
英文:
> Deletion of map elements
>
> The built-in function delete removes the element with key k from a map
> m.
>
> delete(m, k) // remove element m[k] from map m
For example,
package main
import "fmt"
func main() {
m := map[string]string{"key1": "val1", "key2": "val2"}
fmt.Println(m)
delete(m, "key1")
fmt.Println(m)
}
Output:
map[key1:val1 key2:val2]
map[key2:val2]
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