Golang - 从地图上获取一部分密钥 [英] Golang - Getting a slice of keys from a map

问题描述

有没有更简单/更好的方法从Go中的地图中获取一部分键？

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

目前我正在迭代地图和复制到一个切片的关键：

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，

For example,

package main

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

为了在Go中保持高效，重要的是尽量减少内存分配。

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

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