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*.js

README.md

TypeScript samples

Build with:

  $ tsc *.ts

generics.ts

interface Bounds {
  readonly w: number,
  readonly h: number,
  area(): number,
}

type Circle = Bounds & {
  readonly r: number,
}

function circle (r: number) {
  const area = () => Math.PI * r * r;
  return { r, h: r + r, w: r + r, area };
}

const mapper = <T, U>(f: (t: T) => U) =>
  (ts: T[]) => ts.map(f);

const circleMapper = mapper<number, Circle>(circle);

const circles = circleMapper([1, 2, 3]);

interface.ts

interface Bounds {
  readonly w: number, // width
  readonly h: number, // height
  area(): number,
}

function square (w: number, h: number) {
  const area = () => w * h;
  return { h, w, area };
}

function perimeter (b: Bounds) {
  return 2 * (b.w + b.h);
}

console.log(perimeter(square(2, 4)));

point.ts

type Point = {
  x: number,
  y: number,
};

const add =
  (p1: Point, p2: Point): Point => ({
    x: p1.x + p2.x,
    y: p1.y + p2.y,
  });

const p: Point = { x: 1, y: 1 };
const o: Point = { x: 2, y: 3 };

console.log(add(p, o));