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為什么我的映射回傳太多條目？

2021-10-29 10:30:22 .NET開發

我需要映射一組日期。這些日期中的每一個都屬于一組日期（格式陣列）。

所以讓我們說：格式陣列是： let format = [3, 3, 1, 5, 4, 4, 3, 5, 13, 10, 3, 5, 5, 2, 2, 10];

這意味著日期陣列的前三個日期是一組日期，接下來是 3 個；下一個是單個日期，接下來的 5 個……等等。

所以我期望的輸出是 16 個專案（與格式長度相同）。輸出應該是，例如：第一組日期：開始：該組的最低日期結束：該組的最高日期

但是我的輸出回傳了相同的日期長度條目。

let format = [3, 3, 1, 5, 4, 4, 3, 5, 13, 10, 3, 5, 5, 2, 2, 10];
let dates = [
  "2021-10-04T04:00:00.000Z",
  "2021-10-05T04:00:00.000Z",
  "2021-10-06T04:00:00.000Z",
  "2021-10-13T04:00:00.000Z",
  "2021-10-14T04:00:00.000Z",
  "2021-10-15T04:00:00.000Z",
  "2021-10-15T04:00:00.000Z",
  "2021-10-17T22:00:00.000Z",
  "2021-10-18T22:00:00.000Z",
  "2021-10-19T22:00:00.000Z",
  "2021-10-20T22:00:00.000Z",
  "2021-10-21T22:00:00.000Z",
  "2021-10-17T22:00:00.000Z",
  "2021-10-18T22:00:00.000Z",
  "2021-10-19T22:00:00.000Z",
  "2021-10-20T22:00:00.000Z",
  "2021-10-19T04:00:00.000Z",
  "2021-10-20T04:00:00.000Z",
  "2021-10-21T04:00:00.000Z",
  "2021-10-22T04:00:00.000Z",
  "2021-10-19T04:00:00.000Z",
  "2021-10-20T04:00:00.000Z",
  "2021-10-21T04:00:00.000Z",
  "2021-10-25T04:00:00.000Z",
  "2021-10-26T04:00:00.000Z",
  "2021-10-27T04:00:00.000Z",
  "2021-10-28T04:00:00.000Z",
  "2021-10-29T04:00:00.000Z",
  "2021-10-25T04:00:00.000Z",
  "2021-10-26T04:00:00.000Z",
  "2021-10-27T04:00:00.000Z",
  "2021-10-28T04:00:00.000Z",
  "2021-10-29T04:00:00.000Z",
  "2021-11-01T04:00:00.000Z",
  "2021-11-02T04:00:00.000Z",
  "2021-11-03T04:00:00.000Z",
  "2021-11-04T04:00:00.000Z",
  "2021-11-05T04:00:00.000Z",
  "2021-11-08T04:00:00.000Z",
  "2021-11-09T04:00:00.000Z",
  "2021-11-10T04:00:00.000Z",
  "2021-11-01T04:00:00.000Z",
  "2021-11-02T04:00:00.000Z",
  "2021-11-03T04:00:00.000Z",
  "2021-11-04T04:00:00.000Z",
  "2021-11-05T04:00:00.000Z",
  "2021-11-08T04:00:00.000Z",
  "2021-11-09T04:00:00.000Z",
  "2021-11-10T04:00:00.000Z",
  "2021-11-11T04:00:00.000Z",
  "2021-11-12T04:00:00.000Z",
  "2021-11-11T04:00:00.000Z",
  "2021-11-12T04:00:00.000Z",
  "2021-11-13T04:00:00.000Z",
  "2021-11-15T04:00:00.000Z",
  "2021-11-16T04:00:00.000Z",
  "2021-11-17T04:00:00.000Z",
  "2021-11-18T04:00:00.000Z",
  "2021-11-19T04:00:00.000Z",
  "2021-11-16T04:00:00.000Z",
  "2021-11-17T04:00:00.000Z",
  "2021-11-18T04:00:00.000Z",
  "2021-11-19T04:00:00.000Z",
  "2021-11-20T04:00:00.000Z",
  "2021-11-23T04:00:00.000Z",
  "2021-11-24T04:00:00.000Z",
  "2021-11-23T04:00:00.000Z",
  "2021-11-24T04:00:00.000Z",
  "2022-01-05T04:00:00.000Z",
  "2022-01-06T04:00:00.000Z",
  "2022-01-07T04:00:00.000Z",
  "2022-01-10T04:00:00.000Z",
  "2022-01-11T04:00:00.000Z",
  "2022-01-12T04:00:00.000Z",
  "2022-01-13T04:00:00.000Z",
  "2022-01-14T04:00:00.000Z",
  "2022-01-17T04:00:00.000Z",
  "2022-01-18T04:00:00.000Z"
];

var numTimesUsed = 0;
var nameIndex = 0;
let app_multiple = dates.map(function combineTitleData(dataItem, index) {
  if (format[nameIndex] == numTimesUsed) {
    nameIndex  ;
    numTimesUsed = 0;
  }
  numTimesUsed  ;
  let end = new Date(dates[nameIndex]);
  end.setDate(end.getDate()   parseInt(format[nameIndex]) - 1);
  return {
    start: dates[nameIndex],
    end: end
  };
});
//
console.log(app_multiple);

謝謝

uj5u.com熱心網友回復：

Splice將獲得組

const res = format.map(num => dates.splice(0,num))

顯示代碼片段

let format = [3, 3, 1, 5, 4, 4, 3, 5, 13, 10, 3, 5, 5, 2, 2, 10];
let dates = [ "2021-10-04T04:00:00.000Z", "2021-10-05T04:00:00.000Z", "2021-10-06T04:00:00.000Z", "2021-10-13T04:00:00.000Z", "2021-10-14T04:00:00.000Z", "2021-10-15T04:00:00.000Z", "2021-10-15T04:00:00.000Z", "2021-10-17T22:00:00.000Z", "2021-10-18T22:00:00.000Z", "2021-10-19T22:00:00.000Z", "2021-10-20T22:00:00.000Z", "2021-10-21T22:00:00.000Z", "2021-10-17T22:00:00.000Z", "2021-10-18T22:00:00.000Z", "2021-10-19T22:00:00.000Z", "2021-10-20T22:00:00.000Z", "2021-10-19T04:00:00.000Z", "2021-10-20T04:00:00.000Z", "2021-10-21T04:00:00.000Z", "2021-10-22T04:00:00.000Z", "2021-10-19T04:00:00.000Z", "2021-10-20T04:00:00.000Z", "2021-10-21T04:00:00.000Z", "2021-10-25T04:00:00.000Z", "2021-10-26T04:00:00.000Z", "2021-10-27T04:00:00.000Z", "2021-10-28T04:00:00.000Z", "2021-10-29T04:00:00.000Z", "2021-10-25T04:00:00.000Z", "2021-10-26T04:00:00.000Z", "2021-10-27T04:00:00.000Z", "2021-10-28T04:00:00.000Z", "2021-10-29T04:00:00.000Z", "2021-11-01T04:00:00.000Z", "2021-11-02T04:00:00.000Z", "2021-11-03T04:00:00.000Z", "2021-11-04T04:00:00.000Z", "2021-11-05T04:00:00.000Z", "2021-11-08T04:00:00.000Z", "2021-11-09T04:00:00.000Z", "2021-11-10T04:00:00.000Z", "2021-11-01T04:00:00.000Z", "2021-11-02T04:00:00.000Z", "2021-11-03T04:00:00.000Z", "2021-11-04T04:00:00.000Z", "2021-11-05T04:00:00.000Z", "2021-11-08T04:00:00.000Z", "2021-11-09T04:00:00.000Z", "2021-11-10T04:00:00.000Z", "2021-11-11T04:00:00.000Z", "2021-11-12T04:00:00.000Z", "2021-11-11T04:00:00.000Z", "2021-11-12T04:00:00.000Z", "2021-11-13T04:00:00.000Z", "2021-11-15T04:00:00.000Z", "2021-11-16T04:00:00.000Z", "2021-11-17T04:00:00.000Z", "2021-11-18T04:00:00.000Z", "2021-11-19T04:00:00.000Z", "2021-11-16T04:00:00.000Z", "2021-11-17T04:00:00.000Z", "2021-11-18T04:00:00.000Z", "2021-11-19T04:00:00.000Z", "2021-11-20T04:00:00.000Z", "2021-11-23T04:00:00.000Z", "2021-11-24T04:00:00.000Z", "2021-11-23T04:00:00.000Z", "2021-11-24T04:00:00.000Z", "2022-01-05T04:00:00.000Z", "2022-01-06T04:00:00.000Z", "2022-01-07T04:00:00.000Z", "2022-01-10T04:00:00.000Z", "2022-01-11T04:00:00.000Z", "2022-01-12T04:00:00.000Z", "2022-01-13T04:00:00.000Z", "2022-01-14T04:00:00.000Z", "2022-01-17T04:00:00.000Z", "2022-01-18T04:00:00.000Z" ];

const res = format.map(num => {
  const arr = dates.splice(0,num)
  const start = arr.shift(); // take  the first
  const end = arr.length === 0 ? start : arr.pop(); // take the last if there
  return { start, end }
})
console.log(res)

要獲取開始和結束的物件陣列（如果沒有結束，您只要求開始），您可以執行此操作 - 我假設日期字串已排序。如果沒有，您可以輕松地對字串進行排序dates.sort()

const res = format.map(num => {
  const arr = dates.splice(0, num)
  const start = arr.shift();
  const end = arr.length === 0 ? "" : arr.pop(); 
  return end ? { start, end } : { start }
})
console.log(res)

顯示代碼片段

let format = [3, 3, 1, 5, 4, 4, 3, 5, 13, 10, 3, 5, 5, 2, 2, 10];
let dates = [ "2021-10-04T04:00:00.000Z", "2021-10-05T04:00:00.000Z", "2021-10-06T04:00:00.000Z", "2021-10-13T04:00:00.000Z", "2021-10-14T04:00:00.000Z", "2021-10-15T04:00:00.000Z", "2021-10-15T04:00:00.000Z", "2021-10-17T22:00:00.000Z", "2021-10-18T22:00:00.000Z", "2021-10-19T22:00:00.000Z", "2021-10-20T22:00:00.000Z", "2021-10-21T22:00:00.000Z", "2021-10-17T22:00:00.000Z", "2021-10-18T22:00:00.000Z", "2021-10-19T22:00:00.000Z", "2021-10-20T22:00:00.000Z", "2021-10-19T04:00:00.000Z", "2021-10-20T04:00:00.000Z", "2021-10-21T04:00:00.000Z", "2021-10-22T04:00:00.000Z", "2021-10-19T04:00:00.000Z", "2021-10-20T04:00:00.000Z", "2021-10-21T04:00:00.000Z", "2021-10-25T04:00:00.000Z", "2021-10-26T04:00:00.000Z", "2021-10-27T04:00:00.000Z", "2021-10-28T04:00:00.000Z", "2021-10-29T04:00:00.000Z", "2021-10-25T04:00:00.000Z", "2021-10-26T04:00:00.000Z", "2021-10-27T04:00:00.000Z", "2021-10-28T04:00:00.000Z", "2021-10-29T04:00:00.000Z", "2021-11-01T04:00:00.000Z", "2021-11-02T04:00:00.000Z", "2021-11-03T04:00:00.000Z", "2021-11-04T04:00:00.000Z", "2021-11-05T04:00:00.000Z", "2021-11-08T04:00:00.000Z", "2021-11-09T04:00:00.000Z", "2021-11-10T04:00:00.000Z", "2021-11-01T04:00:00.000Z", "2021-11-02T04:00:00.000Z", "2021-11-03T04:00:00.000Z", "2021-11-04T04:00:00.000Z", "2021-11-05T04:00:00.000Z", "2021-11-08T04:00:00.000Z", "2021-11-09T04:00:00.000Z", "2021-11-10T04:00:00.000Z", "2021-11-11T04:00:00.000Z", "2021-11-12T04:00:00.000Z", "2021-11-11T04:00:00.000Z", "2021-11-12T04:00:00.000Z", "2021-11-13T04:00:00.000Z", "2021-11-15T04:00:00.000Z", "2021-11-16T04:00:00.000Z", "2021-11-17T04:00:00.000Z", "2021-11-18T04:00:00.000Z", "2021-11-19T04:00:00.000Z", "2021-11-16T04:00:00.000Z", "2021-11-17T04:00:00.000Z", "2021-11-18T04:00:00.000Z", "2021-11-19T04:00:00.000Z", "2021-11-20T04:00:00.000Z", "2021-11-23T04:00:00.000Z", "2021-11-24T04:00:00.000Z", "2021-11-23T04:00:00.000Z", "2021-11-24T04:00:00.000Z", "2022-01-05T04:00:00.000Z", "2022-01-06T04:00:00.000Z", "2022-01-07T04:00:00.000Z", "2022-01-10T04:00:00.000Z", "2022-01-11T04:00:00.000Z", "2022-01-12T04:00:00.000Z", "2022-01-13T04:00:00.000Z", "2022-01-14T04:00:00.000Z", "2022-01-17T04:00:00.000Z", "2022-01-18T04:00:00.000Z" ];

const res = format.map(num => {
  const arr = dates.splice(0, num)
  const start = arr.shift();
  const end = arr.length === 0 ? "" : arr.pop()
  return end ? { start, end } : { start }
})
console.log(res)

或者相同的開始和結束，如果只有一個日期：

const res = format.map(num => {
  const arr = dates.splice(0, num)
  const start = arr.shift();
  const end = arr.length === 0 ? start : arr.pop(); 
  return { start, end }
})
console.log(res)

uj5u.com熱心網友回復：

Map始終回傳與輸出相同數量的輸入，因此如果您使用日期，則不能期望獲得格式陣列長度輸出。所以我們使用地圖輸入中的格式來獲取陣列集合。

let format = [3, 3, 1, 5, 4, 4, 3, 5, 13, 10, 3, 5, 5, 2, 2, 10];
let dates = [
  "2021-10-04T04:00:00.000Z",
  "2021-10-05T04:00:00.000Z",
  "2021-10-06T04:00:00.000Z",
  "2021-10-13T04:00:00.000Z",
  "2021-10-14T04:00:00.000Z",
  "2021-10-15T04:00:00.000Z",
  "2021-10-15T04:00:00.000Z",
  "2021-10-17T22:00:00.000Z",
  "2021-10-18T22:00:00.000Z",
  "2021-10-19T22:00:00.000Z",
  "2021-10-20T22:00:00.000Z",
  "2021-10-21T22:00:00.000Z",
  "2021-10-17T22:00:00.000Z",
  "2021-10-18T22:00:00.000Z",
  "2021-10-19T22:00:00.000Z",
  "2021-10-20T22:00:00.000Z",
  "2021-10-19T04:00:00.000Z",
  "2021-10-20T04:00:00.000Z",
  "2021-10-21T04:00:00.000Z",
  "2021-10-22T04:00:00.000Z",
  "2021-10-19T04:00:00.000Z",
  "2021-10-20T04:00:00.000Z",
  "2021-10-21T04:00:00.000Z",
  "2021-10-25T04:00:00.000Z",
  "2021-10-26T04:00:00.000Z",
  "2021-10-27T04:00:00.000Z",
  "2021-10-28T04:00:00.000Z",
  "2021-10-29T04:00:00.000Z",
  "2021-10-25T04:00:00.000Z",
  "2021-10-26T04:00:00.000Z",
  "2021-10-27T04:00:00.000Z",
  "2021-10-28T04:00:00.000Z",
  "2021-10-29T04:00:00.000Z",
  "2021-11-01T04:00:00.000Z",
  "2021-11-02T04:00:00.000Z",
  "2021-11-03T04:00:00.000Z",
  "2021-11-04T04:00:00.000Z",
  "2021-11-05T04:00:00.000Z",
  "2021-11-08T04:00:00.000Z",
  "2021-11-09T04:00:00.000Z",
  "2021-11-10T04:00:00.000Z",
  "2021-11-01T04:00:00.000Z",
  "2021-11-02T04:00:00.000Z",
  "2021-11-03T04:00:00.000Z",
  "2021-11-04T04:00:00.000Z",
  "2021-11-05T04:00:00.000Z",
  "2021-11-08T04:00:00.000Z",
  "2021-11-09T04:00:00.000Z",
  "2021-11-10T04:00:00.000Z",
  "2021-11-11T04:00:00.000Z",
  "2021-11-12T04:00:00.000Z",
  "2021-11-11T04:00:00.000Z",
  "2021-11-12T04:00:00.000Z",
  "2021-11-13T04:00:00.000Z",
  "2021-11-15T04:00:00.000Z",
  "2021-11-16T04:00:00.000Z",
  "2021-11-17T04:00:00.000Z",
  "2021-11-18T04:00:00.000Z",
  "2021-11-19T04:00:00.000Z",
  "2021-11-16T04:00:00.000Z",
  "2021-11-17T04:00:00.000Z",
  "2021-11-18T04:00:00.000Z",
  "2021-11-19T04:00:00.000Z",
  "2021-11-20T04:00:00.000Z",
  "2021-11-23T04:00:00.000Z",
  "2021-11-24T04:00:00.000Z",
  "2021-11-23T04:00:00.000Z",
  "2021-11-24T04:00:00.000Z",
  "2022-01-05T04:00:00.000Z",
  "2022-01-06T04:00:00.000Z",
  "2022-01-07T04:00:00.000Z",
  "2022-01-10T04:00:00.000Z",
  "2022-01-11T04:00:00.000Z",
  "2022-01-12T04:00:00.000Z",
  "2022-01-13T04:00:00.000Z",
  "2022-01-14T04:00:00.000Z",
  "2022-01-17T04:00:00.000Z",
  "2022-01-18T04:00:00.000Z"
];


// convert string into dates for comparison
const realDates = dates.map(d => new Date(d));

// use map on format since, map always return the same number of input array length, so that was ur clue to use format instead of dates 
const dateGroup = format.map(num => realDates.slice(0,num));

// now you only need to iterate over the array to return the new form
let app_multiple = dateGroup.map(function createNewObject(singleDateCollection, index) {

  return {
    start: new Date(Math.min.apply(null,singleDateCollection)),
    end: new Date(Math.max.apply(null,singleDateCollection))
  };
});
//
console.log(app_multiple);

轉載請註明出處，本文鏈接：https://www.uj5u.com/net/340807.html

標籤：javascript 数组

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