Collections

List<E>

[E, E, ...]

[7, 9]

Map<K, V>

{
  K: V,
  K: V,
  ...
}

{
  "key1": "value1",
  "key2": "value2"
}

Multimap<K, V>

{
  K: [V, V, ...],
  L: [V, V, ...],
  ...
}

{
  "key1": ["value11", "value12"],
  "key2": ["value12", "value22"]
}