从地图上获取一部分钥匙 [英] Getting a slice of keys from a map

问题描述

在Go中，有没有更简单/更巧妙的方法来从地图中获取键的片段?

Is there any simpler/nicer way of getting a slice of keys from a map in Go?

目前，我正在遍历地图并将关键点复制到一个切片:

Currently I am iterating over the map and copying the keys to a slice:

i := 0
keys := make([]int, len(mymap))
for k := range mymap {
    keys[i] = k
    i++
}

推荐答案

例如，

package main

func main() {
    mymap := make(map[int]string)
    keys := make([]int, 0, len(mymap))
    for k := range mymap {
        keys = append(keys, k)
    }
}

要在Go中高效运行，请尽量减少内存分配.

To be efficient in Go, it's important to minimize memory allocations.

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