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我怎樣才能在javascript中返回兩個對象

JavaScript

MYYA 2024-01-18 16:02:55

舉個例子我有兩個數組const tempData = [ { day: "Mon", temp: 33.6 }, { day: "Tue", temp: 34.6 }, { day: "Wed", temp: 33.1 }, { day: "Fri", temp: 35.6 } ];const coughData = [ { day: "Mon", count: 2 }, { day: "Wed", count: 1 }, { day: "Thur", count: 1 }, { day: "Fri", count: 3 }, { day: "Sat", count: 1 } ]; 我需要將這些數組合并為一個，以便如果日期匹配，則計數值添加到該對象，如果不匹配，則將兩個對象添加到數組中。不知道解釋是否不太清楚預期結果應該是這樣的：const data = [ { day: "Mon", temp: 33.6, count: 2 }, { day: "Tue", temp: 34.6 }, { day: "Wed", temp: 33.1, count: 1 }, { day: "Thur", count: 1 }, { day: "Fri", temp: 35.6, count: 3 }, { day: "Sat", count: 1 } ];我正在嘗試像這樣使用映射函數，但無法理解如果兩個對象不匹配，如何返回它們：const data = tempData.map(temp => { coughData.map(cough => { if (temp.day === cough.day) { return (temp.count = cough.count); } else { return cough; } }); return temp; });

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5 回答

拉丁的傳說

TA貢獻1789條經驗獲得超8個贊

day您可以收集對象中按分組的所有數據，并獲取值作為結果集。

const

addToCollection = (collection, key) => o => Object.assign(collection[o[key]] ??= {}, o),

tempData = [{ day: "Mon", temp: 33.6 }, { day: "Tue", temp: 34.6 }, { day: "Wed", temp: 33.1 }, { day: "Fri", temp: 35.6 }],

coughData = [{ day: "Mon", count: 2 }, { day: "Wed", count: 1 }, { day: "Thur", count: 1 }, { day: "Fri", count: 3 }, { day: "Sat", count: 1 }],

collection = {};

tempData.forEach(addToCollection(collection, 'day'));

coughData.forEach(addToCollection(collection, 'day'));

console.log(Object.values(collection));

.as-console-wrapper { max-height: 100% !important; top: 0; }

反對回復 2024-01-18

冉冉說

TA貢獻1877條經驗獲得超1個贊

您可以先合并數組的對象，然后.reduce()與Map一起使用來累積值。地圖可以通過day屬性作為鍵，這將允許您將相關的對象屬性分組在一起。然后，您可以將Array.from()Map 轉換回對象數組，如下所示：

const tempData = [{ day: "Mon", temp: 33.6 }, { day: "Tue", temp: 34.6 }, { day: "Wed", temp: 33.1 }, { day: "Fri", temp: 35.6 }];

const coughData = [{ day: "Mon", count: 2 }, { day: "Wed", count: 1 }, { day: "Thur", count: 1 }, { day: "Fri", count: 3 }, { day: "Sat", count: 1 }];

const arr = [...tempData, ...coughData];

const result = Array.from(arr.reduce((map, {day, ...rest}) => {

? const seen = map.get(day) || {day};

? return map.set(day, {...seen, ...rest});

}, new Map).values());

console.log(result);

反對回復 2024-01-18

慕神8447489

TA貢獻1780條經驗獲得超1個贊

const tempData = [

{ day: "Mon", temp: 33.6 },

{ day: "Tue", temp: 34.6 },

{ day: "Wed", temp: 33.1 },

{ day: "Fri", temp: 35.6 }

];

const coughData = [

{ day: "Mon", count: 2 },

{ day: "Wed", count: 1 },

{ day: "Thur", count: 1 },

{ day: "Fri", count: 3 },

{ day: "Sat", count: 1 }

];

const tempRes = [...tempData, ...coughData];

const result = tempRes.reduce((acc, curr) => {

const { day, ...rest } = curr;

acc[day] = acc[day] ? Object.assign({}, acc[day], rest) : curr

return acc;

}, {})

console.log(Object.values(result))

.as-console-wrapper { max-height: 100% !important; top: 0; }

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慕姐4208626

TA貢獻1852條經驗獲得超7個贊

let newArray = Array();

let longer = (tempData.length <= coughData.length) ? coughData.length :

tempData.length;

for(let i = 0, j = 0; i < longer; ++i, ++j) {

newArray.push(Object.assign(coughData[i], tempData[j]));

}

打印到控制臺：

[ { day: 'Mon', count: 2, temp: 33.6 },

{ day: 'Tue', count: 1, temp: 34.6 },

{ day: 'Wed', count: 1, temp: 33.1 },

{ day: 'Fri', count: 3, temp: 35.6 },

{ day: 'Sat', count: 1 } ]

反對回復 2024-01-18

慕妹3146593

TA貢獻1820條經驗獲得超9個贊

您可以使用 Object.assign() javascript 函數。Object.assign()方法用于將一個或多個源對象的所有可枚舉屬性的值復制到一個目標對象。該方法將返回目標對象

就像這樣：

const target = { a: 1, b: 2 };

const source = { b: 4, c: 5 };

const returnedTarget = Object.assign(target, source);

console.log(target);

// expected output: Object { a: 1, b: 4, c: 5 }

console.log(returnedTarget);

// expected output: Object { a: 1, b: 4, c: 5 }

https://developer.mozilla.org/pt-BR/docs/Web/JavaScript/Reference/Global_Objects/Object/assign

反對回復 2024-01-18

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我怎樣才能在javascript中返回兩個對象

我怎樣才能在javascript中返回兩個對象

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