javascript - 如何转换要按对象键分组的对象(How can I transform an object to be grouped by object keys)

Question

I have this object which also contains arrays and objects and which is currently grouped by "category"(我有这个对象，它也包含数组和对象，当前按“类别”分组)

data = { vehicles: [ { name: "Team1", cars: [ { multiple: 0.5, category: "cars" }, { multiple: 0.5, category: "cars" } ], bike: [ { multiple: 0.5, category: "bike" } ], scooter: [ { multiple: 0.5, category: "scooter" } ] }, { name: "Team2", cars: [ { multiple: 0.5, category: "cars" }, { multiple: 0.5, category: "cars" } ], bike: [ { multiple: 0.5, category: "bike" } ], scooter: [ { multiple: 0.5, category: "scooter" } ] } ] }; I used this line of code to groupby category but(我使用这行代码对类别进行分组，但是) return xs.reduce(function(rv, x) { (rv[x[key]] = rv[x[key]] || []).push(x); return rv; }, {}); }; var data = groupBy(data, "category"); Since I have the object "data" now I want to perfrom further transformation My question is it possible to groupby two categories so the output looks like this(由于我现在有了对象“ data”，因此我想进行进一步的转换。我的问题是有可能将两个类别分组，以便输出看起来像这样) data = { vehicles: [ { name: "Team1", cars: [ { multiple: 0.5, category: "cars" }, { multiple: 0.5, category: "cars" } ], bike_scooter: [ { multiple: 0.5, category: "bike" }, { multiple: 0.5, category: "scooter" } ] }, { name: "Team2", cars: [ { multiple: 0.5, category: "cars" }, { multiple: 0.5, category: "cars" } ], bike_scooter: [ { multiple: 0.5, category: "bike" }, { multiple: 0.5, category: "scooter" } ] } ] };   ask by newbiexc translate from so

Answer 1

You could do this with two reduce methods one to build vehicles array and other one to group in each object by provided array of keys.(您可以使用two reduce方法来实现此目的，一种是构建车辆数组，另一种是通过提供的键数组将每个对象分组。)

const data = {"vehicles":[{"name":"Team1","cars":[{"multiple":0.5,"category":"cars"},{"multiple":0.5,"category":"cars"}],"bike":[{"multiple":0.5,"category":"bike"}],"scooter":[{"multiple":0.5,"category":"scooter"}]},{"name":"Team2","cars":[{"multiple":0.5,"category":"cars"},{"multiple":0.5,"category":"cars"}],"bike":[{"multiple":0.5,"category":"bike"}],"scooter":[{"multiple":0.5,"category":"scooter"}]}]}; function groupBy(data, keys) { return data.vehicles.reduce((r, {name,...rest}) => { const obj = Object.entries(rest).reduce((a, [k, v]) => { if (keys.includes(k)) { const key = keys.join('_'); if (!a[key]) a[key] = [...v]; else a[key].push(...v); } else a[k] = [...v] return a }, {name}) r.vehicles.push(obj) return r; }, { vehicles: [] }) } console.log(groupBy(data, ['bike', 'scooter'])) console.log(groupBy(data, ['bike', 'cars']))