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Arrays and Collections

Managed arrays​

Hylang supports general managed arrays with C#-style allocation syntax:

int[] values = new int[5];
string[] names = new string[3];

Rules:

  • count must be int
  • void[] is invalid
  • elements are zero/default-initialized
  • arrays are mutable reference types

Supported operations:

values[0] = 42;
int first = values[0];
int len = values.Length;

Out-of-range access is a runtime error.

Arrays of structs and objects​

Arrays may store:

  • primitives like int and bool
  • strings
  • classes
  • structs

Example:

Pair[] pairs = new Pair[2];
pairs[0] = new Pair(9, "pair");

Bootstrap System.Collections.List<T>​

Phase 3 includes a minimal bootstrap List<T> in System.Collections.

Supported API:

  • public List()
  • public void Add(T value)
  • public T Get(int index)
  • public void Set(int index, T value)
  • public int Count()

Example:

using System.Collections;

List<int> values = new List<int>();
values.Add(10);
values.Add(20);
System.Console.WriteLine(values.Count());
System.Console.WriteLine(values.Get(0));

This is intentionally small. Richer collection types belong to later standard-library phases.