Javascript-按年，月和日分組的對象數組

Question

我正在嘗試按日期月份和星期對一組對象進行排序

myArray : [
            {'name' : 'example1', 'date' : '2011-01-01'},
            {'name' : 'example1', 'date' : '2011-01-02'},
            {'name' : 'example1', 'date' : '2011-02-02'},
            {'name' : 'example1', 'date' : '2011-02-15'},
            {'name' : 'example1', 'date' : '2011-02-17'},
            {'name' : 'example1', 'date' : '2012-01-01'},
            {'name' : 'example1', 'date' : '2012-03-03'},
]

我想得到這樣的結果：

result : [{
                    '2011': { // Year 2011
                        '01': { // January
                            '01' : [ // First week of January
                                {'name' : 'example1', 'date' : '2011-01-01'},
                                {'name' : 'example1', 'date' : '2011-01-02'},
                            ]
                        },
                        '02' : { // February
                            '01' : [ // First week of February
                                {'name' : 'example1', 'date' : '2011-02-02'},
                            ],
                            '03' : [
                                {'name' : 'example1', 'date' : '2011-02-15'},
                                {'name' : 'example1', 'date' : '2011-02-17'},
                            ]
                        }
                    },
                    '2012' : { // Year 2012
                        '01' : { // January
                            '01': [ // First week of January
                                {'name': 'example1', 'date': '2012-01-01'}
                            ]
                        },
                        '03': { // March
                            '01' : [ // First week of March
                                {'name' : 'example1', 'date' : '2012-03-03'},
                            ]
                        }
                    }
                }]

我將lodash.groupBy與return getISOWeek(obj.date)或return getMonth(obj.date)或return getYear(obj.date) 。

我設法按年，月，年和周對數據進行排序，但是我無法弄清楚如何同時對這三個數據進行處理。

謝謝你的幫助

Answer 1

您可以將for..of循環， String.prototype.match()與RegExp /\\d+/以獲取YYYY和"date"屬性值的MM部分； Array.prototype.filter()通過將YYYY與"-"和MM串聯，將輸入數組中對象的YYYY-MM與for..of循環中的當前對象進行for..of 。

 const myArray = [ {'name' : 'example1', 'date' : '2011-01-01'}, {'name' : 'example1', 'date' : '2011-01-02'}, {'name' : 'example1', 'date' : '2011-02-02'}, {'name' : 'example1', 'date' : '2011-02-15'}, {'name' : 'example1', 'date' : '2011-02-17'}, {'name' : 'example1', 'date' : '2012-01-01'}, {'name' : 'example1', 'date' : '2012-03-03'}, ]; let res = {}; let fn = (year, month, o = res, array = myArray) => { o[year][month] = { [month]: array.filter(({date: d}) => `${year}-${month}` === d.slice(0, 7)) }; } for (let {date} of myArray) { let [year, month] = date.match(/\\d+/g); if (!res[year]) res[year] = {}; fn(year, month) } console.log(res); 

jsfiddle https://jsfiddle.net/sd7e9Lp7/3/

Answer 2

從您的問題中確實不清楚您要做什么。 ISO周數基於年份而不是月份，例如2011-01-01落在2010年的最后一周而不是2011年的第一周。您真的不能將按月分組和ISO周數相結合，大約10周每年將從一個月開始，到另一個月結束。

如果您將一天的“一個月中的一周”的概念只是Math.ceil(day number / 7) ，則可以Math.ceil(day number / 7)分組，請注意，像2016年2月29日這樣的日期將是第5周中的唯一一天那年二月。

 var data = [ {'name' : 'example1', 'date' : '2011-01-01'}, {'name' : 'example1', 'date' : '2011-01-02'}, {'name' : 'example1', 'date' : '2011-02-02'}, {'name' : 'example1', 'date' : '2011-02-15'}, {'name' : 'example1', 'date' : '2011-02-17'}, {'name' : 'example1', 'date' : '2012-01-01'}, {'name' : 'example1', 'date' : '2012-03-03'}, ]; function groupByMonthWeek(data) { var year, month, week return data.reduce(function (acc, obj) { var b = obj.date.split(/\\D/); // Get custom week number, zero padded var weekNum = '0' + Math.ceil(b[2]/7); // Add year if not already present if (!acc[b[0]]) acc[b[0]] = {}; year = acc[b[0]]; // Add month if not already present if (!year[b[1]]) year[b[1]] = {}; month = year[b[1]]; // Add week if not already present if (!month[weekNum]) month[weekNum] = []; // Add object to week month[weekNum].push(obj); return acc; }, Object.create(null)); } console.log(groupByMonthWeek(data)); 

如果您對混淆感到困惑，可以將其壓縮為以下內容（但我不建議您實際使用）：

 var data = [ {'name' : 'example1', 'date' : '2011-01-01'}, {'name' : 'example1', 'date' : '2011-01-02'}, {'name' : 'example1', 'date' : '2011-02-02'}, {'name' : 'example1', 'date' : '2011-02-15'}, {'name' : 'example1', 'date' : '2011-02-17'}, {'name' : 'example1', 'date' : '2012-01-01'}, {'name' : 'example1', 'date' : '2012-03-03'}, ]; function groupByMonthWeek(data) { return data.reduce((acc, obj) => { var [y, m, d] = obj.date.split(/\\D/); [y, m, '0'+Math.ceil(d/7)].reduce((a,v,i) => a[v] || (a[v] = i < 2 ? {} : []), acc).push(obj); return acc; }, Object.create(null)); } console.log(groupByMonthWeek(data)); 

Answer 3

 function group(arr) { return arr.reduce((r, o) => { var p = o.date.split("-"); // get the parts: year, month and day var week = Math.floor(p.pop() / 7) + 1; // calculate the week number (Math.floor(day / 7) + 1) and remove day from the parts array (p.pop()) var month = p.reduce((o, p) => o[p] = o[p] || {}, r); // get the month object (first, get the year object (if not create one), then get the month object (if not create one) if(month[week]) month[week].push(o); // if there is an array for this week in the month object, then push this object o into that array else month[week] = [o]; // otherwise create a new array for this week that initially contains the object o return r; }, {}); } let array = [{"name":"example1","date":"2011-01-01"},{"name":"example1","date":"2011-01-02"},{"name":"example1","date":"2011-02-02"},{"name":"example1","date":"2011-02-15"},{"name":"example1","date":"2011-02-17"},{"name":"example1","date":"2012-01-01"},{"name":"example1","date":"2012-03-03"}]; console.log(group(array)); 

如果您希望星期數采用"01", "02", ...而不是"1"; "2", ...格式"1"; "2", ... "1"; "2", ... ，然后更改此行：

var week = Math.floor(p.pop() / 7) + 1;

對此：

var week = "0" + Math.floor(p.pop() / 7) + 1;

Answer 4

使用lodash是必經之路。

 var myArray = [ {'name' : 'example1', 'date' : '2011-01-01'}, {'name' : 'example1', 'date' : '2011-01-02'}, {'name' : 'example1', 'date' : '2011-02-02'}, {'name' : 'example1', 'date' : '2011-02-15'}, {'name' : 'example1', 'date' : '2011-02-17'}, {'name' : 'example1', 'date' : '2012-01-01'}, {'name' : 'example1', 'date' : '2012-03-03'}, ]; var orderedByMonths = _.groupBy(myArray, function(element) { return element.date.substring(0,7); }); var orderedByYears = _.groupBy(orderedByMonths, function(month) { return month[0].date.substring(0,4); }); console.log(orderedByYears); 

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