javascript - 如何获取数组中 "key"的值-Javascript

Question

我想获取数组中某个键的值。

arr= [
{key: "a", label: "Adam", value: "121"},
{key: "e", label: "TT", value: "44"},
{key: "ad", label: "RRR", value: "555"}
]
arr2 = ["a","e","ad"];
arr2.map((item) => {
        //here value of item could be oneof the values in arr2
        //say its "a"
        //how do I get the value of key-"label" corresponding to the value in item???
        // in this case the value of label returned should be "Adam"
       result = get(arr, [item, "label"]); // is this possible??
      });

对此有什么想法吗？ 谢谢!

Answer 1

您可以在 arr 中找到该条目，但请注意，这效率很低:

arr2.map(item => arr.find(e => e.key === item).label)

更好的解决方案是将 arr 转换为映射，其中键取自每个对象的 key 属性。