Lodash for reagrup complex Array[object] - arrays

Question

I'm a newbie but i thing this is for Senior Lodash Programmer
I'm new to Lodash and trying to solve this problem but could find a good way to do it.
I have an array of orders and an array of lines with one ticket into each order.
The data is structured as below:
[{
"id": 201,
"order": "Buyer 1",
"lines": ▿[
▿{
"id": 1,
"ticket": ▿{
"id": 151,
"event": ▿{
"id": 31,
"name": "Event 1"
},
"name": "Event 1 Ticket 1",
"price": 39,
"minimum": 1,
"maximum": 5
},
"quantity": 1
},
▿{
"id": 2,
"ticket": {
"id": 152,
"event": {
"id": 31,
"name": "Event 1"
},
"name": "Event 1 Ticket 2",
"price": 60,
"minimum": 2,
"maximum": 4
},
"quantity": 5
},
▿{
"id": 3,
"ticket": {
"id": 153,
"event": {
"id": 33,
"name": "Event 1"
},
"name": "Event 3 Ticket 2",
"price": 60,
"minimum": 2,
"maximum": 4
},
"quantity": 5
}
],
"created_at": "2016-12-22T17:58:27+0000"
},
...]
I need to group all orders by event name and need the next structure:
[{
"event_id": 31,
"event_name":"Event 1",
"total_tickets": 6,
"total_sold": 339
"orders": [
{
"id": 201,
"order": "Buyer 1"
},
....
]},
{
"event_id": 33,
"event_name":"Event 3",
"total_tickets": 5,
"total_sold": 300
"orders":[
{
"id": 201,
"order": "Buyer 1"
}
]},
....
]
"total_tickets" -> sum of order' tickets (quantity) of event
"total_sold" -> sum of order' (price* quantity) of event
Any help will by very usefull

Answer 1

Take a look at _.reduce (or even vainilla JS Array.reduce)
As a friendly advice, try to imagine and sketch - in your mind, or a paper - what exactly needs be done with that data and then start looking for the tools to do it, not the other way around.