首頁猿問如何過濾數組中的對象？

如何過濾數組中的對象？

JavaScript

蕭十郎 2022-09-02 16:18:12

我想用單個對象檢查數組內的條件。let arr = [ { name: "john", description: { height: 5.5, weight: 54, }, }, { name: "mary", description: { height: 5.8, weight: 65, }, }, { name: "smith", description: { height: 6.1, weight: 85, }, },];let obj = { height: 5.8, weight: 65,};我想比較數組中的obj，如果它匹配一個，我想得到這個名字。對于ex來說，obj等于結婚。我想打印瑪麗。這就是我嘗試過的。let result = arr.filter((item) => item.description === obj )console.log(result.name);

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5 回答

慕哥9229398

TA貢獻1877條經驗獲得超6個贊

您可以使用對象的條目構建一個過濾器，并循環訪問所有條目并檢查值。然后映射名稱。

let array = [{ name: "john", description: { height: 5.5, weight: 54 } }, { name: "mary", description: { height: 5.8, weight: 65 } }, { name: "smith", description: { height: 6.1, weight: 85 } }],

object = { height: 5.8, weight: 65 },

filters = Object.entries(object),

result = array

.filter(({ description }) => filters.every(([key, value]) => description[key] === value))

.map(({ name }) => name);

console.log(result);

反對回復 2022-09-02

胡子哥哥

TA貢獻1825條經驗獲得超6個贊

您必須將所需的鍵相互比較，而不是比較對象，因為對象相等性基于它們的內存地址是否相同。

let arr = [

{

description: {

height: 5.5,

weight: 54

}

{

description: {

height: 5.8,

weight: 65

}

{

description: {

height: 6.1,

weight: 85

}

];

let obj = {

height: 5.8,

weight: 65

};

console.log(

arr.filter(item => item.description.height === obj.height && item.description.weight === obj.weight)

);

反對回復 2022-09-02

慕蓋茨4494581

TA貢獻1850條經驗獲得超11個贊

一種方法是使用 .Object.keys

var arr = [ { name: "john", description: { height: 5.5, weight: 54, }, }, { name: "mary", description: { height: 5.8, weight: 65, }, }, { name: "smith", description: { height: 6.1, weight: 85, }}];

var obj = { height: 5.8, weight: 65 };

var result = arr.filter(({description})=>Object.keys(description).every(k=>description[k]==obj[k])).map(({name})=>name);

console.log(result);

反對回復 2022-09-02

海綿寶寶撒

TA貢獻1809條經驗獲得超8個贊

您可以縮小要過濾的屬性范圍，如下所示

let arr = [{

description: {

height: 5.5,

weight: 54

}

{

description: {

height: 5.8,

weight: 65

}

{

description: {

height: 6.1,

weight: 85

}

];

let obj = {

height: 5.8,

weight: 65

};

const filtered = arr.filter(({ description }) => description.height === obj.height && description.weight === obj.weight);

console.log(filtered)

反對回復 2022-09-02

阿波羅的戰車

TA貢獻1862條經驗獲得超6個贊

篩選器篩選條件失敗的根本原因是由于嘗試的對象之間的比較。

對象的比較可以通過使用幫助程序函數來完成。

以下是工作原理：

// array-filter-demo.js

let arr = [

{ name: "john", description: { height: 5.5, weight: 54 } },

{ name: "mary", description: { height: 5.8, weight: 65 } },

{ name: "smith",description: { height: 6.1, weight: 85 } }

]

let obj = { height: 5.8, weight: 65 }

// Helper function to compare objects

function matching(a, b) {

return ( a.height === b.height && a.weight === b.weight)

}

// Call the helper function inside filter

const result = arr.filter(item => (matching(item.description, obj)))

console.log(result)

輸出：

$ node array-filter-demo.js

[ { name: 'mary', description: { height: 5.8, weight: 65 } } ]

反對回復 2022-09-02

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