操縱嵌套 JSON Arrays

Question

我有波紋管 json 陣列

var rowdataarray = [
                     {
                      "products": "Cars",
                      "solddate" : "2022-01-01",
                      "noofitems" : "7"
                     },
                     {
                      "products": "books",
                      "solddate" : "2022-01-01",
                      "noofitems" : "10"
                     },
                     {
                      "products": "Cars",
                      "solddate" : "2022-01-02",
                      "noofitems" : "2"
                     },
                     {
                      "products": "Table",
                      "solddate" : "2022-01-02",
                      "noofitems" : "5"
                     }
                   ];

然后有類別數組

const category = ["Cars","books","Table"]

基於這兩個數組嘗試創建新數組，這將給我每天每種產品售出多少件商品。 創建數據數組時必須遵循上述類別。 如果該產品當天未售出，則應插入為 0。

陣列期待

var finalarray = [{
        date: '2022-01-01',
        data: [7,10,0]
    }, {
        date: '2022-01-02',
        data: [2,0,5]
    }]

編寫的波紋管代碼無法繼續前進

 $.when(
 $.each(category , function (key, val) {

        $.each(rowdataarray , function (key, x) {
    
                if(x.products == val){
                    finalarray .push({
                        "date" : x.solddate,
                        "data" : [x.noofitems]
                    })
                }
        })
 })
 ).then(function () {
    console.log(test)     
   });

Answer 1

1. 按日期收集數據並按產品關聯每個計數
2. Map 遍歷條目並為您的category查詢每個條目

 var rowdataarray = [{"products":"Cars","solddate":"2022-01-01","noofitems":"7"},{"products":"books","solddate":"2022-01-01","noofitems":"10"},{"products":"Cars","solddate":"2022-01-02","noofitems":"2"},{"products":"Table","solddate":"2022-01-02","noofitems":"5"}] const category = ["Cars","books","Table"] const byDate = rowdataarray.reduce((m, { solddate: d, products: p, noofitems: c }) => ({...m, [ d ]: { // the date is the top-level key...m[d], [ p ]: (m[d]?.[p]?? 0) + parseFloat(c) // add the count to any existing product count } }), {}) console.log("byDate", byDate) const finalarray = Object.entries(byDate).map(([ date, counts ]) => ({ date, data: category.map(cat => counts[cat]?? 0) })) console.info("finalarray", finalarray)

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