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如何識別數組 <{}> 的 javascript 對象字段的類型

JavaScript

慕后森 2023-01-06 16:20:03

我有一個 JavaScript 對象，它來自一個可能包含嵌套字段的請求，我需要識別屬于 Array<{}> 類型的字段，我需要單獨迭代該字段，但在 javascript 中我無法實現這一點。任何人都請建議我根據字段類型查找字段的解決方案。樣本對象const obj = {name:'jane', age: 22,interested_books:[{book_name:'xxx', author_name:'yyy'}, {book_name:'aaa', author_name:'zzz'}],hobbies:['reading', 'football'],address:{street_name:'dace street', door_no:12}}在這些字段中，我需要迭代一個數組<{}>的字段（即interested_books）

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4 回答

翻翻過去那場雪

TA貢獻2065條經驗獲得超14個贊

使用 Object.entires()andisArray檢查它是否是一個數組

obj = {

age: 22,

interested_books: [

{ book_name: "xxx", author_name: "yyy" },

{ book_name: "aaa", author_name: "zzz" },

hobbies: ["reading", "football"],

address: { street_name: "dace street", door_no: 12 },

};

function getArrWithOb(obj) {

return Object.fromEntries(

Object.entries(obj).filter((o) => {

if (Array.isArray(o[1])) {

if (o[1].every((ob) => typeof ob == "object")) {

return o;

}

})

);

}

console.log(getArrWithOb(obj));

從評論看來你想要返回的是你可以使用的屬性的名稱reduce

obj = { name: "jane", age: 22, interested_books: [ { book_name: "xxx", author_name: "yyy" }, { book_name: "aaa", author_name: "zzz" }, ], hobbies: ["reading", "football"], address: { street_name: "dace street", door_no: 12 }, };

function getArrWithOb(obj) {

return Object.entries(obj).reduce((r, o) => {

if (Array.isArray(o[1])) {

if (o[1].every((ob) => typeof ob == "object")) {

r.push(o[0]);

}

return r;

}, []);

}

console.log(getArrWithOb(obj));

反對回復 2023-01-06

長風秋雁

TA貢獻1757條經驗獲得超7個贊

使用isArray檢查值是否為數組

const obj = {

age: 22,

interested_books: [{

book_name: 'xxx',

author_name: 'yyy'

}, {

book_name: 'aaa',

author_name: 'zzz'

}],

hobbies: ['reading', 'football'],

address: {

street_name: 'dace street',

door_no: 12

}

for (let keys in obj) {

if (Array.isArray(obj[keys])) {

obj[keys].forEach(item => console.log(item))

}

反對回復 2023-01-06

幕布斯6054654

TA貢獻1876條經驗獲得超7個贊

const obj = {

age: 22,

interested_books: [{

book_name: 'xxx',

author_name: 'yyy'

}, {

book_name: 'aaa',

author_name: 'zzz'

}],

hobbies: ['reading', 'football'],

address: {

street_name: 'dace street',

door_no: 12

}

for (const key in obj) {

if (obj[key] instanceof Array) {

console.log('I am array', key);

const isArrayOfObject = obj[key].every(item => typeof item === "object");

if (isArrayOfObject) {

// your_logic_here

}

反對回復 2023-01-06

交互式愛情

TA貢獻1712條經驗獲得超3個贊

試試下面的功能。這是為了獲取對象中的數組項。

const obj = {

age: 22,

interested_books: [{ book_name: 'xxx', author_name: 'yyy' }, { book_name: 'aaa', author_name: 'zzz' }],

hobbies: ['reading', 'football'],

address: { street_name: 'dace street', door_no: 12 }

};

const getArraysFromObject = obj => {

const results = {};

Object.keys(obj).map(field => {

if (Array.isArray(obj[field])) {

results[field] = obj[field];

}

});

return results;

};

console.log(results);

// {

// "interested_books": [

// { "book_name": "xxx", "author_name": "yyy" },

// { "book_name": "aaa", "author_name": "zzz" }

// ],

// "hobbies": ["reading", "football"]

// }

反對回復 2023-01-06

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如何識別數組 <{}> 的 javascript 對象字段的類型

如何識別數組 <{}> 的 javascript 對象字段的類型

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