Arrays and Collections

JS-surface array methods

export function main(): void {
  const xs = [1, 2, 3];
  const ys = xs.map((x) => x + 1).filter((x) => x > 2);
  console.log(JSON.stringify(ys));
}

This behavior comes from the active @tsonic/js surface.

import { List } from "@tsonic/dotnet/System.Collections.Generic.js";

const xs = new List<number>();
xs.Add(1);
xs.Add(2);

This behavior comes from generated CLR binding packages, not from the JS surface.

import { Enumerable } from "@tsonic/dotnet/System.Linq.js";

const xs = [1, 2, 3];
const ys = Enumerable.Where(xs, (x: number): boolean => x > 1);

Here the array is still a normal Tsonic/TypeScript array, but LINQ behavior is imported explicitly from CLR bindings.

On the JS surface, typed arrays come from @tsonic/js:

export function main(): void {
  const bytes = new Uint8Array([1, 2, 3]);
  bytes.set([4, 5], 1);
  console.log(bytes.length);
}