JavaScript – Creating Object with specific format out of 2 Arrays

I have 2 Arrays.
The Array "people" just holds basic information of some people.
The Array "subscriptions" has a lot of different subscriptions to games.
I want to have have an Array, where I can sort of have an Overview of what game subscriptions each person has. This is not real code I use, I am just trying to get used to JavaScript.

an example Element of an Array called people:

{"number":4251,"name":"Alex","surname":"Scott"}

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an example Element of an Array called subscriptions:

{"number":4329,game:"Tetris"}

I want to make a new new Array with the following format:

person: (people[i]), subscriptions: [(subscriptions[j], subscriptions[j+k], …)]

What I tried:

const array3 = people.map(x => {"person": x , "subscriptions": subscriptions.filter(y => y.number === x.number)});

It get this Error:

SyntaxError: Unexpected token :

How can I insert multiple key value pairs in in these Objects?

>Solution :

This happens because your argument in the map is interperting the { as opening bracket of the method body.

const arr = [{some: 1, object: 2}, {some:3, object:4}]
arr.map((o) => {original: o, cool: 'yes'})

To resolve this you have to explicitly return the object or add additional parenthesis to let the interperter know that this is not the method body:

const arr = [{some: 1, object: 2}, {some:3, object:4}]
const mapped = arr.map((o) => {return {original: o, cool: 'yes'}})
console.log(mapped)

const arr = [{some: 1, object: 2}, {some:3, object:4}]
const mapped = arr.map((o) => ({original: o, cool: 'yes'}))
console.log(mapped)

I hope this helps!