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如何使用Javascript從對(duì)象分組年份？

如何使用Javascript從對(duì)象分組年份？

暮色呼如 2019-04-25 18:14:37
我想在JavaScript中創(chuàng)建一個(gè)新對(duì)象來(lái)分組年份。它會(huì)將數(shù)據(jù)存儲(chǔ)到年份組中。我現(xiàn)在的數(shù)據(jù)：{    "8": {        "date": "2016-02-26",        "value": "0.89000"    },    "7": {        "date": "2017-02-27",        "value": "0.94000"    },    "6": {        "date": "2017-06-01",        "value": "0.94000"    },    "5": {        "date": "2017-08-30",        "value": "0.94000"    },    "4": {        "date": "2017-11-30",        "value": "1.01000"    },    "3": {        "date": "2018-02-28",        "value": "1.01000"    },    "2": {        "date": "2018-06-01",        "value": "1.01000"    },    "1": {        "date": "2018-08-31",        "value": "1.01000"    },    "0": {        "date": "2018-11-30",        "value": "1.16000"    }}我想轉(zhuǎn)換成類似的東西：{    2016: [            {                "date": "2016-02-26",                "value": "0.89000"            }    ],    2017: [            {                "date": "2017-02-27",                "value": "0.94000"            },            {                "date": "2017-06-01",                "value": "0.94000"            },            {                "date": "2017-06-01",                "value": "0.94000"            },             {                "date": "2017-08-30",                "value": "0.94000"            }    ],    2018: [            {                "date": "2018-02-27",                "value": "0.104000"            },            {                "date": "2018-06-01",                "value": "1.01000"            },            {                "date": "2018-08-31",                "value": "1.01000"            },             {                "date": "2018-11-30",                "value": "1.16000"            }    ]}還有一些內(nèi)容可以在此處發(fā)布問(wèn)題。還有一些內(nèi)容可以在此處發(fā)布問(wèn)題。還有一些內(nèi)容可以在此處發(fā)布問(wèn)題。還有一些內(nèi)容可以在此處發(fā)布問(wèn)題。還有一些內(nèi)容可以在此處發(fā)布問(wèn)題。
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4 回答

?
慕標(biāo)5832272

TA貢獻(xiàn)1966條經(jīng)驗(yàn) 獲得超4個(gè)贊

您可以使用Object.values將對(duì)象轉(zhuǎn)換為數(shù)組。使用reduce循環(huán)數(shù)組通，并總結(jié)成一個(gè)對(duì)象。使用substring(0, 4)獲得前4個(gè)字符的日期字符串的。


var obj = {"0":{"date":"2018-11-30","value":"1.16000"},"1":{"date":"2018-08-31","value":"1.01000"},"2":{"date":"2018-06-01","value":"1.01000"},"3":{"date":"2018-02-28","value":"1.01000"},"4":{"date":"2017-11-30","value":"1.01000"},"5":{"date":"2017-08-30","value":"0.94000"},"6":{"date":"2017-06-01","value":"0.94000"},"7":{"date":"2017-02-27","value":"0.94000"},"8":{"date":"2016-02-26","value":"0.89000"}}


var result = Object.values(obj).reduce((c, v) => {

  var y = v.date.substring(0, 4);

  (c[y] = c[y] || []).push(v);

  return c;

}, {});


console.log(result);


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反對(duì) 回復(fù) 2019-05-17
?
眼眸繁星

TA貢獻(xiàn)1873條經(jīng)驗(yàn) 獲得超9個(gè)贊

你可以使用Array.prototype.reduce（）

碼：

const data = {"8": {"date": "2016-02-26","value": "0.89000"},"7": {"date": "2017-02-27","value": "0.94000"},"6": {"date": "2017-06-01","value": "0.94000"},"5": {"date": "2017-08-30","value": "0.94000"},"4": {"date": "2017-11-30","value": "1.01000"},"3": {"date": "2018-02-28","value": "1.01000"},"2": {"date": "2018-06-01","value": "1.01000"},"1": {"date": "2018-08-31","value": "1.01000"},"0": {"date": "2018-11-30","value": "1.16000"}};

const result = Object.values(data).reduce((a, {date, value}) => {

  const year = date.slice(0, 4);

  a[year] = a[year] || [];

  a[year].push({date, value});

  return a;

}, {});


console.log(result);


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反對(duì) 回復(fù) 2019-05-17
?
嗶嗶one

TA貢獻(xiàn)1854條經(jīng)驗(yàn) 獲得超8個(gè)贊

您可以使用單個(gè)Array.reduce執(zhí)行此操作，并且可以在獲取所需的排序輸出之前使用Array.sortreduce：

var data = { "8": { "date": "2016-02-26", "value": "0.89000" }, "7": { "date": "2017-02-27", "value": "0.94000" }, "6": { "date": "2017-06-01", "value": "0.94000" }, "5": { "date": "2017-08-30", "value": "0.94000" }, "4": { "date": "2017-11-30", "value": "1.01000" }, "3": { "date": "2018-02-28", "value": "1.01000" }, "2": { "date": "2018-06-01", "value": "1.01000" }, "1": { "date": "2018-08-31", "value": "1.01000" }, "0": { "date": "2018-11-30", "value": "1.16000" } }


let sortedInput = Object.values(data).sort((a,b) => new Date(a.date) - new Date(b.date))


let result = sortedInput.reduce((r, {date, value}, i, a) => {

  let key = date.split('-')[0]

  r[key] = r[key] || []

  r[key].push({date, value})

  return r

}, {})


console.log(result)


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反對(duì) 回復(fù) 2019-05-17
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