javascript - 删除特定对象后，在数组中的对象中设置新序列

Question

我的目标:我需要在sequenceIndex 中有一个连续的数字序列，它是我的对象中的一个值。

因此，当我删除特定对象时，其他对象的序列索引当然不再连续。我删除的对象正在根据特定值进行检查，以查看数组中是否有其他对象共享相同的值(第二个 if 语句)。如果是这样，那么应该有一个连续的新值集。

输出是 if 语句中的迭代器对于所有操作的对象始终相同。

从此:

const objectsArray = [
  {
    folder: "folderName",
    documents: [
      {
        id: 0,
        sequenceIndex: "0",
        documentType: "letter"
      },
      {
        id: 1,
        sequenceIndex: "1",
        documentType: "letter"
      },
      {
        id: 2,
        sequenceIndex: "2",
        documentType: "letter"
      },
      {
        id: 3,
        sequenceIndex: "3",
        documentType: "letter"
      }
    ]
  }
];

通过删除 id 1 和 2，我想得到这个(请参阅连续的序列索引):

const desiredObjectsArray = [
  {
    folder: "folderName",
    documents: [
      {
        id: 0,
        sequenceIndex: "0",
        documentType: "letter"
      },
      {
        id: 3,
        sequenceIndex: "1",
        documentType: "letter"
      }
    ]
  }
];

到目前为止我的代码:

case ActionType.RemoveDocumentInSpecificFolder:
        return state.map(file => {
          // if in the correct folder remove the object with the delivered id
          if (file.folder=== folder) {
            remove(file.documents, {
              id: action.payload.documents[0].id
            });

            // create newObjArray from objects which share a specific value and replace the sequence index by new value
            const newObjArray = file.documents.map((obj: any) => {
              // if the object has the specific value create new object with new sequenceIndex
              if (obj.documentType === action.payload.documents[0].documentType) {

                //poor attempt to create a sequence
                let i = 0;
                const correctedSequenceDocObject = { ...obj, sequenceIndex: i };
                i++;
                return correctedSequenceDocObject;

              }
              return {
                ...obj
              };
            });
                return {
              ...file,
              documents: newObjArray
            };
          }
          return file;
        });

我希望有人能引导我走向正确的方向。我也总是很感激最佳实践的建议:)

致以诚挚的问候

Answer 1

您可以使用filter和map类似的东西

const arr = [{folder: "folderName",documents: [{id: 0,sequenceIndex: "0",documentType: "letter"},{id: 1,sequenceIndex: "1",documentType: "letter"},{id: 2,sequenceIndex: "2",documentType: "letter"},{id: 3,sequenceIndex: "3",documentType: "letter"}]}];

let getInSequence = (filterId) => {
  return arr[0].documents.filter(({ id }) => !filterId.includes(id))
               .map((v, i) => ({ ...v, sequenceIndex: i }))
}

console.log(getInSequence([1, 2]))