按键值对 JSON 数组进行分组

Question

Please help to combine object keys values from json arrays by key.

 const input=[{ "Date":"04/10/2019", "Time":"15:35", "Title":"Flight -\ Group C", "Description":"Arrival 19:40" }, { "Date":"04/10/2019", "Time":"Evening", "Title":"Welcome drinks", "Description":"In the bar at\ " }, { "Date":"05/10/2019", "Time":"Morning", "Title":"Breakfast", "Description":"At leisure" }, { "Date":"05/10/2019", "Time":"10:00", "Title":"Something Else", "Description":"At leisure" }]; console.log( Object.values(input.reduce((a, { Date }) => { if (!a[Date]) a[Date] = { Date, activities: [] }; a[Date].activities.push(); return a; }, {})) );

I need a combined object keys values in javascript in the following way:

 [ { "date":"04/10/2019", "activities":[ { "Time":"15:35", "Title":"Flight -\ Group C", "Description":"Arrival 19:40" }, { "Time":"Evening", "Title":"Welcome drinks", "Description":"In the bar at\ " } ] }, { "date":"05/10/2019", "activities":[ { "Time":"Morning", "Title":"Breakfast", "Description":"At leisure" } ] } ]

I am trying to get the result with my code but 'activities' are null... I would highly appreciate your help.

Thank you in advance

Answer 1

If you are using parameter destructuring you could use ... rest param to get other properties after you take out the date.

 const input=[{"Date":"04/10/2019","Time":"15:35","Title":"Flight - Group C","Description":"Arrival 19:40"},{"Date":"04/10/2019","Time":"Evening","Title":"Welcome drinks","Description":"In the bar at "},{"Date":"05/10/2019","Time":"Morning","Title":"Breakfast","Description":"At leisure"},{"Date":"05/10/2019","Time":"10:00","Title":"Something Else","Description":"At leisure"}] const object = input.reduce((r, { Date: date, ...rest}) => { if(!r[date]) r[date] = {date, activities: [rest]} else r[date].activities.push(rest) return r }, {}) const result = Object.values(object) console.log(result)