如何附加到地图javascript?

我有地图:

dataMap = new Map<string, string[]>([
    ['Fruits', ['Apple', 'Orange', 'Banana']],
    ['Vegetables', ['Tomato', 'Potato', 'Onion']],
    ['Apple', ['Fuji', 'Macintosh']],
    ['Onion', ['Yellow', 'White', 'Purple']]
  ]);

我试图用键附加新值 Fruits :

dataMap.set("Fruits", "Huaba");

要获得以下信息:

['Fruits', ['Apple', 'Orange', 'Banana', 'Huaba']]...

这个解决方案怎么样:

append(key: string, value: string[]) {
    let _g = this.dataMap.get(key);
    _g = _g.concat(value);
    this.dataMap.set(key, _g);
  }