How to get the slice of keys from a map?

Question

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

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++
}

Gopher · Accepted Answer

The correct answer is no, there is not a simpler/nicer way. package main func main() { mymap := make(map[int]string) keys := make([]int, 0, len(mymap)) for k := range mymap { keys = append(keys, k) } } To be efficient in Go, it's important to minimize memory allocations.

Aditya Agrawal · Answer

You also can take an array of keys with type []Value by method MapKeys of struct Value from package "reflect": package main import ( "fmt" "reflect" ) func main() { abc := map[string]int{ "a": 1, "b": 2, "c": 3, } keys := reflect.ValueOf(abc).MapKeys() fmt.Println(keys) // [a b c] }

Go Language

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