Objects/maps

An object/map is a set of key value properties.

Defining a new map

{"greeting": "hello"}

Creating a map using existing values

{"foo": "bar", "name": "Tom"}. // Just so you can see the input
{
    "baz": foo,
    name // Shorthand for "name": name
}

Adding new fields to a map

We can utilise the spread ... operator here.

Set "name" = "Tom" regardless of what is in the map already:

{
  $this...,
  "name": "Tom"
}

Set "name" = "Tom" only if it doesn't already exist in the map:

{
    "name": "Tom",
    $this...
}