javascript Immutablejs：将地图的键转换为数组的一行代码？

Immutablejs: One liner code to convert keys of a map into array?

提问by Melvin

From the docs: Map#keys

来自文档：Map#keys

I get the keys of a Map and loop through it to transform them into an array. Is there a one line code to cleanly convert these keys into an array?

我获取 Map 的键并循环遍历它以将它们转换为数组。是否有一行代码可以将这些键干净地转换为数组？

回答by OlliM

You can use keySeqinstead of keys, an IndexedSeqhas toArraymethod:

您可以使用keySeq代替keys, 一个IndexedSeqhastoArray方法：

var map = Immutable.fromJS({
  a: 1,
  b: 2,
  c: {
    d: "asdf"
  }
})

var arr = map.keySeq().toArray()

回答by geeklain

If you can use ES6:

如果您可以使用 ES6：

var map = Immutable.fromJS({
  a: 1,
  b: 2,
  c: {
    d: "asdf"
  }
});

var [...arr] = map.keys();
console.log(arr); // ["a", "b", "c"]

Or

或者

var arr = Array.from(map.keys());
console.log(arr); // ["a", "b", "c"]