过滤嵌套数组并返回与键值匹配的数组

Question

我正在尝试根据 id 过滤包含 arrays 的 object 的数组。 我能够过滤它们，但需要稍微清理一下 output，因为它也返回一个空数组，因为该数组的条件不匹配。

我如何解决它？

 const resKey = 'ABC'; const data = [ [{ "user": { "firstName": "John", "lastName": "Smith", }, "id": "ABC" }], [{ "user": { "firstName": "John", "lastName": "Smith", }, "id": "DEF" }] ]; const result = data.map(eachArr => eachArr.filter(eachObj => eachObj.id === resKey)); console.log(result);

预计 Output：

[
  [
    {
      user: {
        firstName: "John",
        lastName: "Smith",
      },
      id: "ABC",
    },
  ],
]

实际 Output：

[
  [
    {
      user: {
        firstName: "John",
        lastName: "Smith",
      },
      id: "ABC",
    },
  ],
  [],
]

Answer 1

您可以使用filter再次过滤掉不包含元素（ length为0 ）的空数组。

.filter((arr) => arr.length);

 const resKey = "ABC"; const data = [ [ { user: { firstName: "John", lastName: "Smith", }, id: "ABC", }, ], [ { user: { firstName: "John", lastName: "Smith", }, id: "DEF", }, ], ]; const result = data.map((eachArr) => eachArr.filter((eachObj) => eachObj.id === resKey)).filter((arr) => arr.length); console.log(result);