javascript - ES6 过滤/减少数组中的对象

Question

给定

commentIdList = [2,3]
comments = { 1 : "a", 2: "b", 3: "c", 4: "d" }

需要输出

filteredComments = [ {2:"b"} , {3:"c"} ]

我不成功的尝试

const filteredComments = comments.filter((c)=> commentsIdList.map(comment=>c.id === comment))

Answer 1

使用Array.map()迭代 commentIdList。通过键 (id) 从 comments 获取值，并使用 computed property names 创建一个新对象:

const commentIdList = [2,3];
const comments = { 1 : "a", 2: "b", 3: "c", 4: "d" }
const filteredComments = commentIdList.map((id) => ({
  [id]: comments[id]
}));

console.log(filteredComments);