Collections

Fixed-size arrays are created with [] literal syntax and are immutable by default:

let numbers = [1, 2, 3, 4, 5]
let strings = ["one", "two", "three"]

This is equivalent to calling the array function directly:

let numbers = array(1, 2, 3, 4, 5)
let strings = array("one", "two", "three")

A mutableArray produces a resizable, settable variant:

let items = mutableArray<i32>[10, 10]()
items[0, 0] = 100

Lists, sets, and maps

Beyond arrays, Nylon has a standard family of collection traits, each with an immutable builder function and a mutable* counterpart:

Immutable:
  List<T>          list(...)   : List<T>
  Set<T>           set(...)    : Set<T>
  Map<T, U>        map(...)    : Map<T, U>

Mutable:
  MutableList<T>       mutableList(...)   : MutableList<T>
  MutableSet<T>        mutableSet(...)    : MutableSet<T>
  MutableMap<T, U>     mutableMap(...)    : MutableMap<T, U>

let names = list("Rick", "James")
let uniqueIds = set(1, 2, 3)