rjz · October 9, 2018 04:13
diff --git a/.gitignore b/.gitignore
 *.js
diff --git a/README.md b/README.md
diff --git a/generics.ts b/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]);

diff --git a/interface.ts b/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)));
diff --git a/point.ts b/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));
	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 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)));