按属性值过滤对象

Question

我有一个包含对象的对象。我想返回一个新对象，该对象仅包含具有特定值属性的对象。const object = {  a: {prop1: 'abc', prop2: 'def', prop3: 'ghi'},  b: {prop1: 'jkl', prop2: 'mno', prop3: 'pqr'},  c: {prop1: 'abc', prop2: 'def', prop3: 'ghi'},  d: {prop1: 'abc', prop2: 123, prop3: 'ghi'}};let group = {};for (let key in object) {  if (object[key].prop1 === 'abc') {    group += object[key];  }  console.log(object[key].prop1);}console.log(group);

Answer 1

+=运算符不能像您预期的那样处理对象。

尝试=像这样的运算符group[key] = object[key]。

const object = {

    a: {prop1: 'abc', prop2: 'def', prop3: 'ghi'},

    b: {prop1: 'jkl', prop2: 'mno', prop3: 'pqr'},

    c: {prop1: 'abc', prop2: 'def', prop3: 'ghi'},

    d: {prop1: 'abc', prop2: 123, prop3: 'ghi'}

};

let group = {};

for (let key in object) {

    if (object[key].prop1 === 'abc') {

        group[key] = object[key];

    }

}

console.log(group);

Answer 2

你可以试试这个

const object = {

    a: {prop1: 'abc', prop2: 'def', prop3: 'ghi'},

    b: {prop1: 'jkl', prop2: 'mno', prop3: 'pqr'},

    c: {prop1: 'abc', prop2: 'def', prop3: 'ghi'},

    d: {prop1: 'abc', prop2: 123, prop3: 'ghi'}

};

let group = {};

for (let key in object) {

    if (object[key].prop1 === 'abc') {

        group[key] = object[key];

    }

    console.log(object[key]);

}

console.log(group);

Answer 3

您使用Object.entries返回对象数组与 [[key, value],[key,value],...] 的组合。接下来，您可以filter根据条件获取数据，最后只保留您想要使用的格式map。

您可以在下面阅读有关这些的更多信息：

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/entries

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/filter

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/fromEntries

var object = {

    a: {prop1: 'abc', prop2: 'def', prop3: 'ghi'},

    b: {prop1: 'jkl', prop2: 'mno', prop3: 'pqr'},

    c: {prop1: 'abc', prop2: 'def', prop3: 'ghi'},

    d: {prop1: 'abc', prop2: 123, prop3: 'ghi'}

};

var arr = Object.entries(object);

   

console.log(Object.fromEntries(arr.filter(a=>a[1].prop1==="abc"))); // Keeps your keys

console.log(arr.filter(a=>a[1].prop1==="abc").map(a1=>a1[1])) // Just array of objects