Javascript:比较和重组数组自己的值

标签 javascript reactjs

我有一个包含键的数组:timestamp 和 price。时间戳是每小时的，我还使用 date-fns 库来比较时间戳是否属于同一天 - 如果是，我试图将当天的所有价格点相加。然而，当我这样做时，我发现了一些差异:

为了清晰起见，数组分为 3 个单独的天:

{
  "prices": [
    [1671818476949, 16854.460790677775],
    [1671822082820, 16845.20394128685],
    [1671825684227, 16857.05646176291],
    [1671829225308, 16829.569665685623],
    [1671832882885, 16825.560754591264],
    [1671836452315, 16802.19013067553],
    [1671840055897, 16791.45543916491],
    [1671843601067, 16828.5039057286],
    [1671847235412, 16818.886333963925],
    [1671850908752, 16828.80915767001],
    [1671854492281, 16849.1353436805],
    [1671858107673, 16844.63646922823],
    [1671861614876, 16826.94422938057],

    [1671865308427, 16830.32100715682],
    [1671868880378, 16859.602706687205],
    [1671872427084, 16838.84722581856],
    [1671876070308, 16843.698114347266],
    [1671879705628, 16833.179777617614],
    [1671883320221, 16826.127986844378],
    [1671886841429, 16835.60904589224],
    [1671890403652, 16826.52735073518],
    [1671894003774, 16840.053047104313],
    [1671897642888, 16844.75966886341],
    [1671901289954, 16846.46639955969],
    [1671904904119, 16846.743046196585],
    [1671908487819, 16849.228682191264],
    [1671912082408, 16853.84096165539],
    [1671915617341, 16848.57056951711],
    [1671919248222, 16838.55847898353],
    [1671922845055, 16847.802247651052],
    [1671926406952, 16848.649159225337],
    [1671930105411, 16849.932721831166],
    [1671933659969, 16848.512350420737],
    [1671937267311, 16836.58057734161],
    [1671940900097, 16842.511784308153],
    [1671944512405, 16837.250031512558],
    [1671948089796, 16835.01977126436],

    [1671951658960, 16837.930437518276],
    [1671955200553, 16831.66911474702],
    [1671958801135, 16841.3948238686],
    [1671962500002, 16839.084643107144],
    [1671966068189, 16834.494972743123],
    [1671969625433, 16833.460321328374],
    [1671973226717, 16832.79193114006],
    [1671976864726, 16814.494641690155],
    [1671980509077, 16781.822451943077],
    [1671984031113, 16821.199913544602],
    [1671987680236, 16820.32217610258],
    [1671991240419, 16807.414662482362],
    [1671994911250, 16794.108452870256],
    [1671998512051, 16769.85904421313],
    [1672002110939, 16772.940684988003],
    [1672005625248, 16820.196694166687],
    [1672009311744, 16813.158456662797],
    [1672012841914, 16842.72026144195],
    [1672016506486, 16843.359409890574],
    [1672020041689, 16852.772718398166],
    [1672023659844, 16883.023913256362],
    [1672027284022, 16895.732317171107],
    [1672030862669, 16882.371697632705],

    [1672034480606, 16862.501900560783],
    [1672038111850, 16853.824750006406],
    [1672041654416, 16845.9569876033],
    [1672045227499, 16843.843448135598],
    [1672048916306, 16848.912074255015],
    [1672052466904, 16859.749930767142],
    [1672056072318, 16865.679924348886],
    [1672059600720, 16862.520948313442],
    [1672063223636, 16840.16651774838],
    [1672066882254, 16836.402019038687],
    [1672070414455, 16818.749629565693],
    [1672074026355, 16841.011497434578],
    [1672077687367, 16841.16468121544],
    [1672081285285, 16823.19653988069],
    [1672084914724, 16846.539413040075],
    [1672088451149, 16844.521298565145],
    [1672092105680, 16839.48881574047],
    [1672095707553, 16843.692990272582],
    [1672099308191, 16895.753539841488],
    [1672102868807, 16869.94367902591],
    [1672106436652, 16869.681983132617],
    [1672110025423, 16889.298174537],
    [1672113676425, 16869.264589868446],
    [1672117308026, 16890.08282608721],
    [1672120880596, 16875.43904573174],

    [1672124490175, 16876.94990058372],
    [1672128063768, 16869.15484593176],
    [1672131709243, 16861.249964108203],
    [1672135267379, 16886.480841768516],
    [1672138903770, 16865.316599966118],
    [1672142409979, 16835.8325998708],
    [1672146052583, 16808.706816185026],
    [1672149645559, 16825.2039722797],
    [1672153287438, 16777.896913134075],
    [1672156909469, 16795.71982274382],
    [1672160506962, 16778.505439723354]
  ]
}

我尝试过以下方法:

let sumPrice = 0;
let priceArr = [];
for (let i = 0; i < coinHistory.prices?.length; i++) {
  const coin = coinHistory.prices[i];
  const currentDate = coin[0];
  const currentPrice = coin[1];
  if (i === 0) {
    sumPrice = currentPrice;
  }

  if (i >= 1) {
    const prevDate = coinHistory.prices[i - 1][0];
    const prevPrice = coinHistory.prices[i - 1][1];
    const stillSameDay = isSameDay(currentDate,prevDate);

      if (stillSameDay) {
         sumPrice += currentPrice;
      } else{
        priceArr.push({timeStampDate: prevDate 
        ,totalDailySum: sumPrice});
        sumPrice = currentPrice;
      }
  }
}

我得到的结果:

[
{timeStampDate: 1671861614876, totalDailySum: 218802.4126234967},
{timeStampDate: 1671948089796, totalDailySum: 404208.3927127256}, 
{timeStampDate: 1672034480606, totalDailySum: 403928.82564146793}, 
{timeStampDate: 1672120880596, totalDailySum: 404514.88530415593}
]

如您所见，结果不包括从 1672124490175 开始的时间戳(该月 27 号)，与 1672120880596(该月 26 号)不同。

预期输入:

[
{timeStampDate: 1671861614876, totalDailySum: TOTAL_PRICES_FOR_ALL_MATHING_TIMESTAMPS},
{timeStampDate: 1671948089796, totalDailySum: TOTAL_PRICES_FOR_ALL_MATHING_TIMESTAMPS}, 
{timeStampDate: 1672034480606, totalDailySum: TOTAL_PRICES_FOR_ALL_MATHING_TIMESTAMPS}, 
{timeStampDate: 1672120880596, totalDailySum: TOTAL_PRICES_FOR_ALL_MATHING_TIMESTAMPS},
{timeStampDate: 1672160506962, totalDailySum: TOTAL_PRICES_FOR_ALL_MATHING_TIMESTAMPS}
]

最佳答案

你的代码没问题。您只是忘记了一个细节:如果遇到新日期，您只在结果数组中存储一个值。但在最后一天之后，不会遇到新的日期，并且最后一天的数据永远不会存储在数组中。

要解决这个问题，您可以简单地添加一个特殊情况，将最后一天的数据推送到数组中:

if (i + 1 === coinHistory.prices.length) {
  priceArr.push({
    timeStampDate: currentDate,
    totalDailySum: sumPrice
  });
}

这是我用来测试它的完整工作代码:

function isSameDay(d1, d2) {
  d1 = new Date(d1)
  d2 = new Date(d2)
  return d1.getFullYear() === d2.getFullYear() &&
    d1.getMonth() === d2.getMonth() &&
    d1.getDate() === d2.getDate();
}


let sumPrice = 0;
let priceArr = [];
for (let i = 0; i < coinHistory.prices.length; i++) {
  const coin = coinHistory.prices[i];
  const currentDate = coin[0];
  const currentPrice = coin[1];
  if (i !== 0) {
    const prevDate = coinHistory.prices[i - 1][0];
    const prevPrice = coinHistory.prices[i - 1][1];

    if (!isSameDay(currentDate, prevDate)) {
      priceArr.push({
        timeStampDate: prevDate,
        totalDailySum: sumPrice
      });
      sumPrice = 0; // reset
    }
  }
  sumPrice += currentPrice;

    // save the last day
  if (i + 1 === coinHistory.prices.length) {
    priceArr.push({
      timeStampDate: currentDate,
      totalDailySum: sumPrice
    });
  }
}


console.log(priceArr)
<script>
  window.coinHistory = {
    prices: [
      [1671818476949, 16854.460790677775],
      [1671822082820, 16845.20394128685],
      [1671825684227, 16857.05646176291],
      [1671829225308, 16829.569665685623],
      [1671832882885, 16825.560754591264],
      [1671836452315, 16802.19013067553],
      [1671840055897, 16791.45543916491],
      [1671843601067, 16828.5039057286],
      [1671847235412, 16818.886333963925],
      [1671850908752, 16828.80915767001],
      [1671854492281, 16849.1353436805],
      [1671858107673, 16844.63646922823],
      [1671861614876, 16826.94422938057],

      [1671865308427, 16830.32100715682],
      [1671868880378, 16859.602706687205],
      [1671872427084, 16838.84722581856],
      [1671876070308, 16843.698114347266],
      [1671879705628, 16833.179777617614],
      [1671883320221, 16826.127986844378],
      [1671886841429, 16835.60904589224],
      [1671890403652, 16826.52735073518],
      [1671894003774, 16840.053047104313],
      [1671897642888, 16844.75966886341],
      [1671901289954, 16846.46639955969],
      [1671904904119, 16846.743046196585],
      [1671908487819, 16849.228682191264],
      [1671912082408, 16853.84096165539],
      [1671915617341, 16848.57056951711],
      [1671919248222, 16838.55847898353],
      [1671922845055, 16847.802247651052],
      [1671926406952, 16848.649159225337],
      [1671930105411, 16849.932721831166],
      [1671933659969, 16848.512350420737],
      [1671937267311, 16836.58057734161],
      [1671940900097, 16842.511784308153],
      [1671944512405, 16837.250031512558],
      [1671948089796, 16835.01977126436],

      [1671951658960, 16837.930437518276],
      [1671955200553, 16831.66911474702],
      [1671958801135, 16841.3948238686],
      [1671962500002, 16839.084643107144],
      [1671966068189, 16834.494972743123],
      [1671969625433, 16833.460321328374],
      [1671973226717, 16832.79193114006],
      [1671976864726, 16814.494641690155],
      [1671980509077, 16781.822451943077],
      [1671984031113, 16821.199913544602],
      [1671987680236, 16820.32217610258],
      [1671991240419, 16807.414662482362],
      [1671994911250, 16794.108452870256],
      [1671998512051, 16769.85904421313],
      [1672002110939, 16772.940684988003],
      [1672005625248, 16820.196694166687],
      [1672009311744, 16813.158456662797],
      [1672012841914, 16842.72026144195],
      [1672016506486, 16843.359409890574],
      [1672020041689, 16852.772718398166],
      [1672023659844, 16883.023913256362],
      [1672027284022, 16895.732317171107],
      [1672030862669, 16882.371697632705],

      [1672034480606, 16862.501900560783],
      [1672038111850, 16853.824750006406],
      [1672041654416, 16845.9569876033],
      [1672045227499, 16843.843448135598],
      [1672048916306, 16848.912074255015],
      [1672052466904, 16859.749930767142],
      [1672056072318, 16865.679924348886],
      [1672059600720, 16862.520948313442],
      [1672063223636, 16840.16651774838],
      [1672066882254, 16836.402019038687],
      [1672070414455, 16818.749629565693],
      [1672074026355, 16841.011497434578],
      [1672077687367, 16841.16468121544],
      [1672081285285, 16823.19653988069],
      [1672084914724, 16846.539413040075],
      [1672088451149, 16844.521298565145],
      [1672092105680, 16839.48881574047],
      [1672095707553, 16843.692990272582],
      [1672099308191, 16895.753539841488],
      [1672102868807, 16869.94367902591],
      [1672106436652, 16869.681983132617],
      [1672110025423, 16889.298174537],
      [1672113676425, 16869.264589868446],
      [1672117308026, 16890.08282608721],
      [1672120880596, 16875.43904573174],

      [1672124490175, 16876.94990058372],
      [1672128063768, 16869.15484593176],
      [1672131709243, 16861.249964108203],
      [1672135267379, 16886.480841768516],
      [1672138903770, 16865.316599966118],
      [1672142409979, 16835.8325998708],
      [1672146052583, 16808.706816185026],
      [1672149645559, 16825.2039722797],
      [1672153287438, 16777.896913134075],
      [1672156909469, 16795.71982274382],
      [1672160506962, 16778.505439723354]
    ]
  }

</script>

https://jsfiddle.net/timlg07/0Ldnt6ko/

关于Javascript:比较和重组数组自己的值，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/74932415/

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