如何遍歷陣列陣列以過濾或拒絕重復條目？-有解無憂

我想遍歷這個二維陣列。具有多個物件的陣列在同一月份有多個條目（在下面一月的示例中）。我想過濾掉（拒絕）重復的條目并希望回傳更改后的陣列。

我在這里嘗試了不同的解決方案，但到目前為止失敗了；我將不勝感激任何意見！

[[
  { "id":"9","bookingReason":"Netto Neu Eigen","bookingDate":"2021-01-22","bookingType":"Gutschrift","bookingPoints":"100" },
  { "id":"10","bookingReason":"Netto Neu Eigen","bookingDate":"2021-01-23","bookingType":"Gutschrift","bookingPoints":"100" }
], [
  { "id":"9","bookingReason":"Netto Neu Eigen","bookingDate":"2021-01-22","bookingType":"Gutschrift","bookingPoints":"100" },
  { "id":"10","bookingReason":"Netto Neu Eigen","bookingDate":"2021-01-23","bookingType":"Gutschrift","bookingPoints":"100" }
], [
  { "id":"29","bookingReason":"Netto Neu Eigen","bookingDate":"2022-01-22","bookingType":"Gutschrift","bookingPoints":"100" },
  { "id":"30","bookingReason":"Netto Neu Eigen","bookingDate":"2022-01-23","bookingType":"Gutschrift","bookingPoints":"100" }
], [
  { "id":"29","bookingReason":"Netto Neu Eigen","bookingDate":"2022-01-22","bookingType":"Gutschrift","bookingPoints":"100" },
  { "id":"30","bookingReason":"Netto Neu Eigen","bookingDate":"2022-01-23","bookingType":"Gutschrift","bookingPoints":"100" }
]]

編輯對 traktor 的回答：我想至少要檢查每個子陣列是否是唯一的。因此，如果過濾器第二次找到相同的 id，則應該洗掉整個重復陣列。

編輯對 Peter Seliger 的回答：結果應該保持二維結構。

[
  [{
    "id": "1",
    "bookingReason": "Netto Neu Eigen",
    "bookingDate": "2021-09-22",
    "bookingType": "Gutschrift",
    "bookingPoints": "100"
  }], [{
    "id": "2",
    "bookingReason": "Netto Neu Eigen",
    "bookingDate": "2021-08-22",
    "bookingType": "Gutschrift",
    "bookingPoints": "100"
  }], [{
    "id": "3",
    "bookingReason": "Netto Neu Eigen",
    "bookingDate": "2021-07-22",
    "bookingType": "Gutschrift",
    "bookingPoints": "100"
  }], [{
    "id": "4",
    "bookingReason": "Netto Neu Eigen",
    "bookingDate": "2021-06-22",
    "bookingType": "Gutschrift",
    "bookingPoints": "100"
  }], [{
    "id": "5",
    "bookingReason": "Netto Neu Eigen",
    "bookingDate": "2021-05-22",
    "bookingType": "Gutschrift",
    "bookingPoints": "100"
  }], [{
    "id": "6",
    "bookingReason": "Netto Neu Eigen",
    "bookingDate": "2021-04-22",
    "bookingType": "Gutschrift",
    "bookingPoints": "100"
  }], [{
    "id": "7",
    "bookingReason": "Netto Neu Eigen",
    "bookingDate": "2021-03-22",
    "bookingType": "Gutschrift",
    "bookingPoints": "100"
  }, {
    "id": "12",
    "bookingReason": "Netto Neu Eigen",
    "bookingDate": "2021-03-24",
    "bookingType": "Gutschrift",
    "bookingPoints": "100"
  }], [{
    "id": "8",
    "bookingReason": "Netto Neu Eigen",
    "bookingDate": "2021-02-22",
    "bookingType": "Gutschrift",
    "bookingPoints": "100"
  }, {
    "id": "11",
    "bookingReason": "Netto Neu Eigen",
    "bookingDate": "2021-02-23",
    "bookingType": "Gutschrift",
    "bookingPoints": "100"
  }], [{
    "id": "9",
    "bookingReason": "Netto Neu Eigen",
    "bookingDate": "2021-01-22",
    "bookingType": "Gutschrift",
    "bookingPoints": "100"
  }, {
    "id": "10",
    "bookingReason": "Netto Neu Eigen",
    "bookingDate": "2021-01-23",
    "bookingType": "Gutschrift",
    "bookingPoints": "100"
  }], [{
    "id": "9",
    "bookingReason": "Netto Neu Eigen",
    "bookingDate": "2021-01-22",
    "bookingType": "Gutschrift",
    "bookingPoints": "100"
  }, {
    "id": "10",
    "bookingReason": "Netto Neu Eigen",
    "bookingDate": "2021-01-23",
    "bookingType": "Gutschrift",
    "bookingPoints": "100"
  }], [{
    "id": "8",
    "bookingReason": "Netto Neu Eigen",
    "bookingDate": "2021-02-22",
    "bookingType": "Gutschrift",
    "bookingPoints": "100"
  }, {
    "id": "11",
    "bookingReason": "Netto Neu Eigen",
    "bookingDate": "2021-02-23",
    "bookingType": "Gutschrift",
    "bookingPoints": "100"
  }], [{
    "id": "7",
    "bookingReason": "Netto Neu Eigen",
    "bookingDate": "2021-03-22",
    "bookingType": "Gutschrift",
    "bookingPoints": "100"
  }, {
    "id": "12",
    "bookingReason": "Netto Neu Eigen",
    "bookingDate": "2021-03-24",
    "bookingType": "Gutschrift",
    "bookingPoints": "100"
  }], [{
    "id": "21",
    "bookingReason": "Netto Neu Eigen",
    "bookingDate": "2022-09-22",
    "bookingType": "Gutschrift",
    "bookingPoints": "100"
  }], [{
    "id": "22",
    "bookingReason": "Netto Neu Eigen",
    "bookingDate": "2022-08-22",
    "bookingType": "Gutschrift",
    "bookingPoints": "100"
  }], [{
    "id": "23",
    "bookingReason": "Netto Neu Eigen",
    "bookingDate": "2022-07-22",
    "bookingType": "Gutschrift",
    "bookingPoints": "100"
  }], [{
    "id": "24",
    "bookingReason": "Netto Neu Eigen",
    "bookingDate": "2022-06-22",
    "bookingType": "Gutschrift",
    "bookingPoints": "100"
  }], [{
    "id": "25",
    "bookingReason": "Netto Neu Eigen",
    "bookingDate": "2022-05-22",
    "bookingType": "Gutschrift",
    "bookingPoints": "100"
  }], [{
    "id": "26",
    "bookingReason": "Netto Neu Eigen",
    "bookingDate": "2022-04-22",
    "bookingType": "Gutschrift",
    "bookingPoints": "100"
  }], [{
    "id": "27",
    "bookingReason": "Netto Neu Eigen",
    "bookingDate": "2022-03-22",
    "bookingType": "Gutschrift",
    "bookingPoints": "100"
  }, {
    "id": "32",
    "bookingReason": "Netto Neu Eigen",
    "bookingDate": "2022-03-24",
    "bookingType": "Gutschrift",
    "bookingPoints": "200"
  }], [{
    "id": "28",
    "bookingReason": "Netto Neu Eigen",
    "bookingDate": "2022-02-22",
    "bookingType": "Gutschrift",
    "bookingPoints": "100"
  }, {
    "id": "31",
    "bookingReason": "Netto Neu Eigen",
    "bookingDate": "2022-02-23",
    "bookingType": "Gutschrift",
    "bookingPoints": "400"
  }], [{
    "id": "29",
    "bookingReason": "Netto Neu Eigen",
    "bookingDate": "2022-01-22",
    "bookingType": "Gutschrift",
    "bookingPoints": "100"
  }, {
    "id": "30",
    "bookingReason": "Netto Neu Eigen",
    "bookingDate": "2022-01-23",
    "bookingType": "Gutschrift",
    "bookingPoints": "100"
  }], [{
    "id": "29",
    "bookingReason": "Netto Neu Eigen",
    "bookingDate": "2022-01-22",
    "bookingType": "Gutschrift",
    "bookingPoints": "100"
  }, {
    "id": "30",
    "bookingReason": "Netto Neu Eigen",
    "bookingDate": "2022-01-23",
    "bookingType": "Gutschrift",
    "bookingPoints": "100"
  }], [{
    "id": "28",
    "bookingReason": "Netto Neu Eigen",
    "bookingDate": "2022-02-22",
    "bookingType": "Gutschrift",
    "bookingPoints": "100"
  }, {
    "id": "31",
    "bookingReason": "Netto Neu Eigen",
    "bookingDate": "2022-02-23",
    "bookingType": "Gutschrift",
    "bookingPoints": "400"
  }], [{
    "id": "27",
    "bookingReason": "Netto Neu Eigen",
    "bookingDate": "2022-03-22",
    "bookingType": "Gutschrift",
    "bookingPoints": "100"
  }, {
    "id": "32",
    "bookingReason": "Netto Neu Eigen",
    "bookingDate": "2022-03-24",
    "bookingType": "Gutschrift",
    "bookingPoints": "200"
  }]
]

uj5u.com熱心網友回復：

OP實際上意味著什么......

“我想過濾掉雙重條目并希望回傳過濾后的陣列。”

...是OP想要直接改變提供的資料結構或者可能是它的結構化克隆。這變得更加清楚......

“因此，如果過濾器第二次找到相同的 id，則應該洗掉整個重復陣列。”

“編輯對 Peter Seliger 的回答：結果應該保持二維結構。”

因此，必須提出一種遞回作業的拒絕方法。

提供的實作使用自定義鍵（屬性名稱）特定值的查找。如果該值尚不存在，則迭代繼續，但該值被分配給查找。任何具有相同、已分配值的陣列項都splice從陣列中獲取（這是一個變異任務）并推送到本地rejected陣列中。該函式的回傳值是一個物件，它具有兩個陣列……mutated參考傳遞和處理/變異的資料結構，rejected它是從提供的資料結構中拒絕的專案的平面串列。

function rejecItemsOfSameKeyAndValueRecursively(
  arr = [], key = '', lookup = new Map,
) {
  const rejected = [];

  for (let idx = 0; idx < arr.length; idx  ) {
    const item = arr[idx];

    if (Array.isArray(item)) {

      // recursion in order to handle nested array structures.
      rejected
        .push(
          ...rejecItemsOfSameKeyAndValueRecursively(item, key, lookup).rejected
        );

      // ... and in case one wants to also get rid
      //     of the now possibly empty array item ...
      if (item.length === 0) {
        // remove empty array item.
        arr.splice(idx, 1);
        // re/adjust the proceeding index value.
        --idx; 
      }

    } else if (!!item && typeof item === 'object') {
      const value = item[key];

      if (lookup.has(value)) {

        rejected
          .push(
            // remove duplicate item from array.
            arr.splice(idx, 1)
          );

        --idx; // re/adjust the proceeding index value.

      } else {
        lookup.set(value, value);
      }
    }
  }
  return { mutated: arr, rejected };
}

const sampleData = [[
  { "id":"1","bookingReason":"Netto Neu Eigen","bookingDate":"2021-09-22","bookingType":"Gutschrift","bookingPoints":"100" }
], [
  { "id":"2","bookingReason":"Netto Neu Eigen","bookingDate":"2021-08-22","bookingType":"Gutschrift","bookingPoints":"100" }
], [
  { "id":"3","bookingReason":"Netto Neu Eigen","bookingDate":"2021-07-22","bookingType":"Gutschrift","bookingPoints":"100" }
], [
  { "id":"4","bookingReason":"Netto Neu Eigen","bookingDate":"2021-06-22","bookingType":"Gutschrift","bookingPoints":"100" }
], [
  { "id":"5","bookingReason":"Netto Neu Eigen","bookingDate":"2021-05-22","bookingType":"Gutschrift","bookingPoints":"100" }
], [
  { "id":"6","bookingReason":"Netto Neu Eigen","bookingDate":"2021-04-22","bookingType":"Gutschrift","bookingPoints":"100" }
], [
  { "id":"7","bookingReason":"Netto Neu Eigen","bookingDate":"2021-03-22","bookingType":"Gutschrift","bookingPoints":"100" },
  { "id":"12","bookingReason":"Netto Neu Eigen","bookingDate":"2021-03-24","bookingType":"Gutschrift","bookingPoints":"100" }
], [
  { "id":"8","bookingReason":"Netto Neu Eigen","bookingDate":"2021-02-22","bookingType":"Gutschrift","bookingPoints":"100" },
  { "id":"11","bookingReason":"Netto Neu Eigen","bookingDate":"2021-02-23","bookingType":"Gutschrift","bookingPoints":"100" }
], [
  { "id":"9","bookingReason":"Netto Neu Eigen","bookingDate":"2021-01-22","bookingType":"Gutschrift","bookingPoints":"100" },
  { "id":"10","bookingReason":"Netto Neu Eigen","bookingDate":"2021-01-23","bookingType":"Gutschrift","bookingPoints":"100" }
], [
  { "id":"9","bookingReason":"Netto Neu Eigen","bookingDate":"2021-01-22","bookingType":"Gutschrift","bookingPoints":"100" },
  { "id":"10","bookingReason":"Netto Neu Eigen","bookingDate":"2021-01-23","bookingType":"Gutschrift","bookingPoints":"100" }
], [
  { "id":"8","bookingReason":"Netto Neu Eigen","bookingDate":"2021-02-22","bookingType":"Gutschrift","bookingPoints":"100" },
  { "id":"11","bookingReason":"Netto Neu Eigen","bookingDate":"2021-02-23","bookingType":"Gutschrift","bookingPoints":"100" }
], [
  { "id":"7","bookingReason":"Netto Neu Eigen","bookingDate":"2021-03-22","bookingType":"Gutschrift","bookingPoints":"100" },
  { "id":"12","bookingReason":"Netto Neu Eigen","bookingDate":"2021-03-24","bookingType":"Gutschrift","bookingPoints":"100" }
], [
  { "id":"21","bookingReason":"Netto Neu Eigen","bookingDate":"2022-09-22","bookingType":"Gutschrift","bookingPoints":"100" }
], [
  { "id":"22","bookingReason":"Netto Neu Eigen","bookingDate":"2022-08-22","bookingType":"Gutschrift","bookingPoints":"100" }
], [
  { "id":"23","bookingReason":"Netto Neu Eigen","bookingDate":"2022-07-22","bookingType":"Gutschrift","bookingPoints":"100" }
], [
  { "id":"24","bookingReason":"Netto Neu Eigen","bookingDate":"2022-06-22","bookingType":"Gutschrift","bookingPoints":"100" }
], [
  { "id":"25","bookingReason":"Netto Neu Eigen","bookingDate":"2022-05-22","bookingType":"Gutschrift","bookingPoints":"100" }
], [
  { "id":"26","bookingReason":"Netto Neu Eigen","bookingDate":"2022-04-22","bookingType":"Gutschrift","bookingPoints":"100" }
], [
  { "id":"27","bookingReason":"Netto Neu Eigen","bookingDate":"2022-03-22","bookingType":"Gutschrift","bookingPoints":"100" },
  { "id":"32","bookingReason":"Netto Neu Eigen","bookingDate":"2022-03-24","bookingType":"Gutschrift","bookingPoints":"200" }
], [
  { "id":"28","bookingReason":"Netto Neu Eigen","bookingDate":"2022-02-22","bookingType":"Gutschrift","bookingPoints":"100" },
  { "id":"31","bookingReason":"Netto Neu Eigen","bookingDate":"2022-02-23","bookingType":"Gutschrift","bookingPoints":"400" }
], [
  { "id":"29","bookingReason":"Netto Neu Eigen","bookingDate":"2022-01-22","bookingType":"Gutschrift","bookingPoints":"100" },
  { "id":"30","bookingReason":"Netto Neu Eigen","bookingDate":"2022-01-23","bookingType":"Gutschrift","bookingPoints":"100" }
], [
  { "id":"29","bookingReason":"Netto Neu Eigen","bookingDate":"2022-01-22","bookingType":"Gutschrift","bookingPoints":"100" },
  { "id":"30","bookingReason":"Netto Neu Eigen","bookingDate":"2022-01-23","bookingType":"Gutschrift","bookingPoints":"100" }
], [
  { "id":"28","bookingReason":"Netto Neu Eigen","bookingDate":"2022-02-22","bookingType":"Gutschrift","bookingPoints":"100" },
  { "id":"31","bookingReason":"Netto Neu Eigen","bookingDate":"2022-02-23","bookingType":"Gutschrift","bookingPoints":"400" }
], [
  { "id":"27","bookingReason":"Netto Neu Eigen","bookingDate":"2022-03-22","bookingType":"Gutschrift","bookingPoints":"100" },
  { "id":"32","bookingReason":"Netto Neu Eigen","bookingDate":"2022-03-24","bookingType":"Gutschrift","bookingPoints":"200" }
]];

const cloneDataStructure = (typeof structuredClone === 'function')
  ? structuredClone
  : value => JSON.parse(JSON.stringify(value));


const data = cloneDataStructure(sampleData);
const { mutated, rejected } = rejecItemsOfSameKeyAndValueRecursively(data, 'id');

console.log(
  '... mutated/rejected by `id` ... ',
);
console.log(
  '(mutated === data) ?..',
  (mutated === data),
);
console.log(
  { mutated, rejected },
);


const data_2 = cloneDataStructure(sampleData);
const { mutated: mutated_2, rejected: rejected_2 } =
  rejecItemsOfSameKeyAndValueRecursively(cloneDataStructure(data_2), 'bookingPoints');

console.log(
  '... mutated/rejected by `bookingPoints` ... ',
);
console.log(
  '(mutated_2 === data_2) ?..',
  (mutated_2 === data_2),
);
console.log(
  { mutated_2, rejected_2 },
);

.as-console-wrapper { min-height: 100%!important; top: 0; }

uj5u.com熱心網友回復：

我不確定我是否正確地閱讀了這個問題，但如果你需要做的就是獲取這個參差不齊的二維陣列并從任何嵌套陣列中過濾掉重復的條目，那么我認為這很簡單：

const dedupe = (
  data, found = new Set(), result,
  test = (x) => ((result = ! found .has (x .id)), (found .add (x .id)), result)
) => data .map ((group) => group .filter (test)) .filter (x => x .length > 0)


const data = [[{id: "1", bookingReason: "Netto Neu Eigen", bookingDate: "2021-09-22", bookingType: "Gutschrift", bookingPoints: "100"}], [{id: "2", bookingReason: "Netto Neu Eigen", bookingDate: "2021-08-22", bookingType: "Gutschrift", bookingPoints: "100"}], [{id: "3", bookingReason: "Netto Neu Eigen", bookingDate: "2021-07-22", bookingType: "Gutschrift", bookingPoints: "100"}], [{id: "4", bookingReason: "Netto Neu Eigen", bookingDate: "2021-06-22", bookingType: "Gutschrift", bookingPoints: "100"}], [{id: "5", bookingReason: "Netto Neu Eigen", bookingDate: "2021-05-22", bookingType: "Gutschrift", bookingPoints: "100"}], [{id: "6", bookingReason: "Netto Neu Eigen", bookingDate: "2021-04-22", bookingType: "Gutschrift", bookingPoints: "100"}], [{id: "7", bookingReason: "Netto Neu Eigen", bookingDate: "2021-03-22", bookingType: "Gutschrift", bookingPoints: "100"}, {id: "12", bookingReason: "Netto Neu Eigen", bookingDate: "2021-03-24", bookingType: "Gutschrift", bookingPoints: "100"}], [{id: "8", bookingReason: "Netto Neu Eigen", bookingDate: "2021-02-22", bookingType: "Gutschrift", bookingPoints: "100"}, {id: "11", bookingReason: "Netto Neu Eigen", bookingDate: "2021-02-23", bookingType: "Gutschrift", bookingPoints: "100"}], [{id: "9", bookingReason: "Netto Neu Eigen", bookingDate: "2021-01-22", bookingType: "Gutschrift", bookingPoints: "100"}, {id: "10", bookingReason: "Netto Neu Eigen", bookingDate: "2021-01-23", bookingType: "Gutschrift", bookingPoints: "100"}], [{id: "9", bookingReason: "Netto Neu Eigen", bookingDate: "2021-01-22", bookingType: "Gutschrift", bookingPoints: "100"}, {id: "10", bookingReason: "Netto Neu Eigen", bookingDate: "2021-01-23", bookingType: "Gutschrift", bookingPoints: "100"}], [{id: "8", bookingReason: "Netto Neu Eigen", bookingDate: "2021-02-22", bookingType: "Gutschrift", bookingPoints: "100"}, {id: "11", bookingReason: "Netto Neu Eigen", bookingDate: "2021-02-23", bookingType: "Gutschrift", bookingPoints: "100"}], [{id: "7", bookingReason: "Netto Neu Eigen", bookingDate: "2021-03-22", bookingType: "Gutschrift", bookingPoints: "100"}, {id: "12", bookingReason: "Netto Neu Eigen", bookingDate: "2021-03-24", bookingType: "Gutschrift", bookingPoints: "100"}], [{id: "21", bookingReason: "Netto Neu Eigen", bookingDate: "2022-09-22", bookingType: "Gutschrift", bookingPoints: "100"}], [{id: "22", bookingReason: "Netto Neu Eigen", bookingDate: "2022-08-22", bookingType: "Gutschrift", bookingPoints: "100"}], [{id: "23", bookingReason: "Netto Neu Eigen", bookingDate: "2022-07-22", bookingType: "Gutschrift", bookingPoints: "100"}], [{id: "24", bookingReason: "Netto Neu Eigen", bookingDate: "2022-06-22", bookingType: "Gutschrift", bookingPoints: "100"}], [{id: "25", bookingReason: "Netto Neu Eigen", bookingDate: "2022-05-22", bookingType: "Gutschrift", bookingPoints: "100"}], [{id: "26", bookingReason: "Netto Neu Eigen", bookingDate: "2022-04-22", bookingType: "Gutschrift", bookingPoints: "100"}], [{id: "27", bookingReason: "Netto Neu Eigen", bookingDate: "2022-03-22", bookingType: "Gutschrift", bookingPoints: "100"}, {id: "32", bookingReason: "Netto Neu Eigen", bookingDate: "2022-03-24", bookingType: "Gutschrift", bookingPoints: "200"}], [{id: "28", bookingReason: "Netto Neu Eigen", bookingDate: "2022-02-22", bookingType: "Gutschrift", bookingPoints: "100"}, {id: "31", bookingReason: "Netto Neu Eigen", bookingDate: "2022-02-23", bookingType: "Gutschrift", bookingPoints: "400"}], [{id: "29", bookingReason: "Netto Neu Eigen", bookingDate: "2022-01-22", bookingType: "Gutschrift", bookingPoints: "100"}, {id: "30", bookingReason: "Netto Neu Eigen", bookingDate: "2022-01-23", bookingType: "Gutschrift", bookingPoints: "100"}], [{id: "29", bookingReason: "Netto Neu Eigen", bookingDate: "2022-01-22", bookingType: "Gutschrift", bookingPoints: "100"}, {id: "30", bookingReason: "Netto Neu Eigen", bookingDate: "2022-01-23", bookingType: "Gutschrift", bookingPoints: "100"}], [{id: "28", bookingReason: "Netto Neu Eigen", bookingDate: "2022-02-22", bookingType: "Gutschrift", bookingPoints: "100"}, {id: "31", bookingReason: "Netto Neu Eigen", bookingDate: "2022-02-23", bookingType: "Gutschrift", bookingPoints: "400"}], [{id: "27", bookingReason: "Netto Neu Eigen", bookingDate: "2022-03-22", bookingType: "Gutschrift", bookingPoints: "100"}, {id: "32", bookingReason: "Netto Neu Eigen", bookingDate: "2022-03-24", bookingType: "Gutschrift", bookingPoints: "200"}]]

console .log (dedupe (data))

.as-console-wrapper {max-height: 100% !important; top: 0}

我們寫了一些我通常會盡量避免的東西：一個有狀態的函式關閉id我們目前看到的可變 Set 的集合。此函式用作filter呼叫嵌套陣列的回呼。我傾向于避免使用有狀態函式，但替代方法似乎是嵌套折疊，這很有效。

我假設我們不希望在洗掉任何基本重復項后留下空組。如果這個假設是錯誤的，我們可以簡單地洗掉最后的filter呼叫。

該版本在語法上很密集。以下變體可能對某些人更有吸引力：

const dedupe = (data) => {
  const found = new Set()
  const test = (x) => {
    const result = ! found .has (x .id)
    found .add (x .id)
    return result
  }
  return data .map ((group) => group .filter (test)) 
              .filter (x => x .length > 0)
}

他們做同樣的事情。

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標籤：javascript 数组递归筛选拼接

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