javascript - 如何获取具有嵌套属性的 Javascript 对象的子集？

Question

我正在使用 Angular 进行开发，我有以下 Typescript 对象数组:

docs = [
    { 
        id: '1',
        type: {
            id: 1
            desc: 'Category 1',
        }
        title: 'Foo",
        date: '2018-06-21',
        attachments: [
            { id: 51, filename: 'foo.pdf', title: 'Foo' },
            { id: 20, filename: 'bar.doc', title: 'Bar' }
        ]
    },
    { 
        id: '2',
        type: {
            id: 2
            desc: 'Category 2',
        }
        title: 'Bar",
        date: '2018-06-21',
        attachments: [
            { id: 15, filename: 'foobar.xls', title: 'Foobar' },
            { id: 201, filename: 'example.doc', title: 'Example' }
        ]
    }
]

我只需要获取一部分属性，如下所示:

docs = [
    { 
        id: '1',
        type: {
            id: 1
            desc: 'Category 1',
        }
        attachments: [
            { id: 51 },
            { id: 20 }
        ]
    },
    { 
        id: '2',
        type: {
            id: 2
            desc: 'Category 2',
        }
        attachments: [
            { id: 15 },
            { id: 201 }
        ]
    }
]

我怎样才能做到这一点？ 我是否需要创建解析器或是否存在任何智能方式(例如 Lodash)来提取数组的精简版？

Answer 1

var docs = [{"id":"1","type":{"id":1,"desc":"Category 1"},"title":"Foo","date":"2018-06-21","attachments":[{"id":51,"filename":"foo.pdf","title":"Foo"},{"id":20,"filename":"bar.doc","title":"Bar"}]},{"id":"2","type":{"id":2,"desc":"Category 2"},"title":"Bar","date":"2018-06-21","attachments":[{"id":15,"filename":"foobar.xls","title":"Foobar"},{"id":201,"filename":"example.doc","title":"Example"}]}];

const result = docs.map(({id,type,attachments})=>{
    let doc={id,type};
    doc.attachments=attachments.map(({id})=>({id}));
    return doc;
});

console.log(result);

看看这个。这非常有效!