Add an Object in an array of Objects Javascript

Question

I need to add an object identified by a key in an array that specifies the id in the course property.

The Array

[{ "course": 1035, <- The id to find in the objects "start_time": "2018-01-04T20:55:00Z", "end_time": "2018-01-04T22:00:00Z", "details": { <- it has to be created <- here the corresponding object according to the id, in this case 1035 } }, { "course": 1106, "start_time": "2018-01-04T21:00:00Z", "end_time": "2018-01-04T22:00:00Z", }] 

The Objects

{ "1035": { "id": 1035, "title": "Some Title1", "slug": "live-show", "free": true, "order": 0, "color": "#CB13A1" }, "1106": { "id": 1106, "title": "Some Title2", "slug": "live-show", "free": true, "order": 0, "color": "#CB13A1" } } 

The expected result

[{ "course": 1035, "start_time": "2018-01-04T20:55:00Z", "end_time": "2018-01-04T22:00:00Z", "details": { "id": 1035, "title": "Some Title1", "slug": "live-show", "free": true, "order": 0, "color": "#CB13A1" } }, { "course": 1106, "start_time": "2018-01-04T21:00:00Z", "end_time": "2018-01-04T22:00:00Z", "details": { "id": 1106, "title": "Some Title2", "slug": "live-show", "free": true, "order": 0, "color": "#CB13A1" } }] 

Answer 1

One-liner without mutating your objects/arrays (which is generally a bad idea).

target.map(item => Object.assign({}, item, { details: source[item.course]})); 

where target = The Array and source = The Objects

Answer 2

var arr =[{ "course": 1035, "start_time": "2018-01-04T20:55:00Z", "end_time": "2018-01-04T22:00:00Z", "details": { } }, { "course": 1106, "start_time": "2018-01-04T21:00:00Z", "end_time": "2018-01-04T22:00:00Z", }]; var obj = { "1035": { "id": 1035, "title": "Some Title1", "slug": "live-show", "free": true, "order": 0, "color": "#CB13A1" }, "1106": { "id": 1106, "title": "Some Title2", "slug": "live-show", "free": true, "order": 0, "color": "#CB13A1" } }; arr.forEach(item=>{ item.details = obj[item.course]; }); console.log(arr); /*RESULT: [ { "course": 1035, "start_time": "2018-01-04T20:55:00Z", "end_time": "2018-01-04T22:00:00Z", "details": { "id": 1035, "title": "Some Title1", "slug": "live-show", "free": true, "order": 0, "color": "#CB13A1" } }, { "course": 1106, "start_time": "2018-01-04T21:00:00Z", "end_time": "2018-01-04T22:00:00Z", "details": { "id": 1106, "title": "Some Title2", "slug": "live-show", "free": true, "order": 0, "color": "#CB13A1" } } ] */

Answer 3

You can do it like this:

Object.keys(object).map(key => { const obj = object[key] // here, you can add all missed keys to your object return obj })