這是我的問題的后續。我從對象數組中按日期獲取分組值。當我對值進行分組時，如果按日期對每天缺少的類型進行分組，則可以將指標填寫為 0。這是我的數組：arr = [        {           "date": "2020-01-01",           "metric": 32,           "type": "Google"        },        {           "date": "2020-01-01",           "metric": 24,           "type": "Bing"        },        {           "date": "2020-01-02",           "metric": 1,           "type": "Google"        },        {           "date": "2020-01-02",           "metric": 32,           "type": "Jeeves"        },        {           "date": "2020-01-03",           "metric": 24,           "type": "Bing"        },        {           "date": "2020-01-03",           "metric": 30,           "type": "Google"        }    ]以下是我對數據進行分組的方式：const groupBy = (array, key) => {    return array.reduce((result, currentValue) => {      (result[currentValue[key]] = result[currentValue[key]] || []).push(currentValue);      return result;    }, {});};const personGroupedByColor = groupBy(arr, 'date');我的結果是：2020-01-01: 0: {date: "2020-01-01", metric: 32, type: "Google"}1: {date: "2020-01-01", metric: 24, type: "Bing"}2020-01-02: 0: {date: "2020-01-02", metric: 1, type: "Google"}1: {date: "2020-01-02", metric: 32, type: "Jeeves"}2020-01-03: 0: {date: "2020-01-03", metric: 24, type: "Bing"}1: {date: "2020-01-03", metric: 30, type: "Google"}有什么辦法可以得到：2020-01-01: 0: {date: "2020-01-01", metric: 32, type: "Google"}1: {date: "2020-01-01", metric: 24, type: "Bing"}2: {date: "2020-01-01", metric: 0, type: "Jeeves"}2020-01-02: 0: {date: "2020-01-02", metric: 1, type: "Google"}1: {date: "2020-01-02", metric: 0, type: "Bing"}2: {date: "2020-01-02", metric: 32, type: "Jeeves"}2020-01-03: 0: {date: "2020-01-03", metric: 30, type: "Google"}1: {date: "2020-01-03", metric: 24, type: "Bing"}2: {date: "2020-01-03", metric: 0, type: "Jeeves"}是否可以將缺失值替換為指標 0？