對數組內的對象進行排序

Question

我的變量optionsPergunta一個我需要排序的對象數組options ：

我嘗試過類似的東西：

optionsPergunta.sort(this.sorteiaArray)

sorteiaArray(){
   return Math.random() < Math.random()
}

但是當我執行console.log(optionsPergunta.options) ，位置沒有改變

optionsPergunta 是查詢的結果，所以當我做一個 console.log(optionsPergunta) 我有這個結果：

[
  BookUnitQuestionOption {
    __setters__: [
      '$attributes',
      '$persisted',
      'primaryKeyValue',
      '$originalAttributes',
      '$relations',
      '$sideLoaded',
      '$parent',
      '$frozen',
      '$visible',
      '$hidden'
    ],
    '$attributes': {
      id: 6,
      book_unit_question_id: 2,
      description: 'get',
      image_sound: null,
      correct: true,
      status: false,
      user_id: 1,
      created_at: 2019-12-27T19:06:27.000Z,
      updated_at: 2019-12-27T19:06:27.000Z
    },
    '$persisted': true,
    '$originalAttributes': {
      id: 6,
      book_unit_question_id: 2,
      description: 'get',
      image_sound: null,
      correct: true,
      status: false,
      user_id: 1,
      created_at: 2019-12-27T19:06:27.000Z,
      updated_at: 2019-12-27T19:06:27.000Z
    },
    '$relations': {},
    '$sideLoaded': {},
    '$parent': null,
    '$frozen': false,
    '$visible': undefined,
    '$hidden': undefined
  },
  BookUnitQuestionOption {
    __setters__: [
      '$attributes',
      '$persisted',
      'primaryKeyValue',
      '$originalAttributes',
      '$relations',
      '$sideLoaded',
      '$parent',
      '$frozen',
      '$visible',
      '$hidden'
    ],
    '$attributes': {
      id: 9,
      book_unit_question_id: 2,
      description: 'stay',
      image_sound: null,
      correct: false,
      status: false,
      user_id: 1,
      created_at: 2019-12-27T19:06:45.000Z,
      updated_at: 2019-12-27T19:06:45.000Z
    },
    '$persisted': true,
    '$originalAttributes': {
      id: 9,
      book_unit_question_id: 2,
      description: 'stay',
      image_sound: null,
      correct: false,
      status: false,
      user_id: 1,
      created_at: 2019-12-27T19:06:45.000Z,
      updated_at: 2019-12-27T19:06:45.000Z
    },
    '$relations': {},
    '$sideLoaded': {},
    '$parent': null,
    '$frozen': false,
    '$visible': undefined,
    '$hidden': undefined
  },
  BookUnitQuestionOption {
    __setters__: [
      '$attributes',
      '$persisted',
      'primaryKeyValue',
      '$originalAttributes',
      '$relations',
      '$sideLoaded',
      '$parent',
      '$frozen',
      '$visible',
      '$hidden'
    ],
    '$attributes': {
      id: 5,
      book_unit_question_id: 2,
      description: 'are',
      image_sound: null,
      correct: false,
      status: false,
      user_id: 1,
      created_at: 2019-12-27T19:06:21.000Z,
      updated_at: 2019-12-27T19:06:33.000Z
    },
    '$persisted': true,
    '$originalAttributes': {
      id: 5,
      book_unit_question_id: 2,
      description: 'are',
      image_sound: null,
      correct: false,
      status: false,
      user_id: 1,
      created_at: 2019-12-27T19:06:21.000Z,
      updated_at: 2019-12-27T19:06:33.000Z
    },
    '$relations': {},
    '$sideLoaded': {},
    '$parent': null,
    '$frozen': false,
    '$visible': undefined,
    '$hidden': undefined
  },
  BookUnitQuestionOption {
    __setters__: [
      '$attributes',
      '$persisted',
      'primaryKeyValue',
      '$originalAttributes',
      '$relations',
      '$sideLoaded',
      '$parent',
      '$frozen',
      '$visible',
      '$hidden'
    ],
    '$attributes': {
      id: 8,
      book_unit_question_id: 2,
      description: 'move',
      image_sound: null,
      correct: false,
      status: false,
      user_id: 1,
      created_at: 2019-12-27T19:06:43.000Z,
      updated_at: 2019-12-27T19:06:43.000Z
    },
    '$persisted': true,
    '$originalAttributes': {
      id: 8,
      book_unit_question_id: 2,
      description: 'move',
      image_sound: null,
      correct: false,
      status: false,
      user_id: 1,
      created_at: 2019-12-27T19:06:43.000Z,
      updated_at: 2019-12-27T19:06:43.000Z
    },
    '$relations': {},
    '$sideLoaded': {},
    '$parent': null,
    '$frozen': false,
    '$visible': undefined,
    '$hidden': undefined
  }
]

當我返回結果並在郵遞員中測試時，我有這個：

[
  {
    "id": 6,
    "book_unit_question_id": 2,
    "description": "get",
    "image_sound": null,
    "correct": true,
    "status": false,
    "user_id": 1,
    "created_at": "2019-12-27 16:06:27",
    "updated_at": "2019-12-27 16:06:27"
  },
  {
    "id": 9,
    "book_unit_question_id": 2,
    "description": "stay",
    "image_sound": null,
    "correct": false,
    "status": false,
    "user_id": 1,
    "created_at": "2019-12-27 16:06:45",
    "updated_at": "2019-12-27 16:06:45"
  },
  {
    "id": 5,
    "book_unit_question_id": 2,
    "description": "are",
    "image_sound": null,
    "correct": false,
    "status": false,
    "user_id": 1,
    "created_at": "2019-12-27 16:06:21",
    "updated_at": "2019-12-27 16:06:33"
  },
  {
    "id": 8,
    "book_unit_question_id": 2,
    "description": "move",
    "image_sound": null,
    "correct": false,
    "status": false,
    "user_id": 1,
    "created_at": "2019-12-27 16:06:43",
    "updated_at": "2019-12-27 16:06:43"
  }
]

Answer 1

長話短說。 optionsPergunta指的是sort()來自Array.prototype.sort()的對象，這意味着您需要對數組調用sort() 。 另一件事是sorteiaArray沒有function ，因此解釋器雖然應該是函數調用。

 const optionsPergunta = { "options": [ { "id": 6, "book_unit_question_id": 2, "description": "get", "image_sound": null, "correct": true, "status": false, "user_id": 1, "created_at": "2019-12-27 16:06:27", "updated_at": "2019-12-27 16:06:27" }, { "id": 5, "book_unit_question_id": 2, "description": "are", "image_sound": null, "correct": false, "status": false, "user_id": 1, "created_at": "2019-12-27 16:06:21", "updated_at": "2019-12-27 16:06:33" }, { "id": 7, "book_unit_question_id": 2, "description": "go to", "image_sound": null, "correct": false, "status": false, "user_id": 1, "created_at": "2019-12-27 16:06:39", "updated_at": "2019-12-27 16:06:39" }, { "id": 8, "book_unit_question_id": 2, "description": "move", "image_sound": null, "correct": false, "status": false, "user_id": 1, "created_at": "2019-12-27 16:06:43", "updated_at": "2019-12-27 16:06:43" } ] } function sorteiaArray(){ return Math.random() < Math.random() } console.log(optionsPergunta.options.sort(sorteiaArray))

Answer 2

顯然，您不需要對數組進行排序，而是對其進行洗牌。

通過使用返回隨機值的比較函數對數組進行排序來混洗數組並不是一個好主意。 對於某些排序算法，它會導致無法保證結束的循環。

如果您需要對數組進行混洗，有一種更好（並且可能更快）的方法：從數組中隨機選擇一項，將其從數組中刪除並將其附加到新數組（混洗后的數組）中。 代碼可能如下所示：

// Create a new array to not change the original
let source = optionsPergunta.slice();
// Store the shuffled items here
let shuffled = [];

while (source.length) {
  let index = Math.floor(Math.random() * Math.floor(source.length));
  let items = source.splice(index, 1);
  shuffled.push(items[0]);
}