如何从复杂对象数组中获取一组唯一属性(How to get an array of unique properties from an array of complex objects)

如何从复杂对象数组中获取一组唯一属性(How to get an array of unique properties from an array of complex objects)

我有一个类似的对象数组

const array = [ { documentId: "document1", writers: [ { name: "writer1", date: "2017-12-11" }, { name: "writer2", date: "2017-12-11" } ] }, { documentId: "document2", writers: [ { name: "writer1", date: "2017-12-11" }, { name: "writer3", date: "2017-12-11" } ] }, { documentId: "document3", writers: [ { name: "writer3", date: "2017-12-11" }, { name: "writer4", date: "2017-12-11" } ] },

我正在尝试提取所有唯一编写者的名称，并将它们与他们编写的所有文档相匹配，以便最终数组看起来像这样：

const finalArray = [ {name: "writter1", documents: ["document1", "document2"]}, {name: "writter2", documents: ["document1"]}, {name: "writter3", documents: ["document2", "document3"]}, {name: "writter4", documents: ["document3"]} ]

I have an array of objects similar to

const array = [ { documentId: "document1", writers: [ { name: "writer1", date: "2017-12-11" }, { name: "writer2", date: "2017-12-11" } ] }, { documentId: "document2", writers: [ { name: "writer1", date: "2017-12-11" }, { name: "writer3", date: "2017-12-11" } ] }, { documentId: "document3", writers: [ { name: "writer3", date: "2017-12-11" }, { name: "writer4", date: "2017-12-11" } ] },

I'm trying to extract all the unique writer's names and match them to all the documents they have written so that the final array looks something like this:

const finalArray = [ {name: "writter1", documents: ["document1", "document2"]}, {name: "writter2", documents: ["document1"]}, {name: "writter3", documents: ["document2", "document3"]}, {name: "writter4", documents: ["document3"]} ]

最满意答案

您可以使用Map将编写器作为键，然后在数组上调用reduce以将文档映射到编写器，然后在Map对象上调用values() ：

const ret = Array.from(array.reduce((acc, val) => { val.writers.forEach(({ name }) => { let w = acc.get(name) || { name: name, documents: [] }; w.documents = w.documents.concat(val.documentId); acc.set(name, w); }); return acc; }, new Map()).values()); console.log(ret);

You can use Map to keep writers as keys then call reduce on your array to map documents to writers, then call values() on the Map object:

const ret = Array.from(array.reduce((acc, val) => { val.writers.forEach(({ name }) => { let w = acc.get(name) || { name: name, documents: [] }; w.documents = w.documents.concat(val.documentId); acc.set(name, w); }); return acc; }, new Map()).values()); console.log(ret);