David Piepgrass qwertie

## private-box.ts
class PrivateBox {
  constructor(private width: number, private height: number) {}
  area() { return this.width * this.height; }
}
let x = new PrivateBox(4, 5);
console.log(x.area()); // OK
console.log(x.width); // ERROR: 'width' is private and only
                      // accessible within class 'PrivateBox'.

## IBox.ts
interface IBox {
    readonly width: number;
    readonly height: number;
}
interface IArea {
    readonly area: number;
}

## (incomplete) b+tree.ts
// Type parameters can have default values,
// so `var t: BTree` means `var t: BTree<any,any>`
export class BTree<K=any, V=any>
{
  // Root node (key-value pairs are stored in here)
  private _root: BNode<K, V>;
  // Total number of items in the collection
  _size: number = 0;
  // Maximum number of items in a single node
  _maxNodeSize: number;

## whatAmI.ts
function whatAmI(thing: string|RegExp|null|number[]|Date) {
  if (thing instanceof RegExp || typeof thing === "string") {
    // Here, TypeScript knows that thing is RegExp|string
    if (typeof thing !== "string")
      console.log("Ahh, so it's a RegExp: " + thing.toString());
    else
      console.log("It's a string of length " + thing.length);
  } else {
    // Here, TypeScript knows that thing is null|number|Date
    if (thing == null)

## CharCategories.html
<!doctype html>
<html>
	<head>
		<style>
			p { font-family: serif; }
			table {
				border-collapse:collapse;
			}
			table td, table td {
				vertical-align: top;
	class PrivateBox {
	constructor(private width: number, private height: number) {}
	area() { return this.width * this.height; }
	}
	let x = new PrivateBox(4, 5);
	console.log(x.area()); // OK
	console.log(x.width); // ERROR: 'width' is private and only
	// accessible within class 'PrivateBox'.
	interface IBox {
	readonly width: number;
	readonly height: number;
	}
	interface IArea {
	readonly area: number;
	}
	// Type parameters can have default values,
	// so `var t: BTree` means `var t: BTree<any,any>`
	export class BTree<K=any, V=any>
	{
	// Root node (key-value pairs are stored in here)
	private _root: BNode<K, V>;
	// Total number of items in the collection
	_size: number = 0;
	// Maximum number of items in a single node
	_maxNodeSize: number;
	function whatAmI(thing: string\|RegExp\|null\|number[]\|Date) {
	if (thing instanceof RegExp \|\| typeof thing === "string") {
	// Here, TypeScript knows that thing is RegExp\|string
	if (typeof thing !== "string")
	console.log("Ahh, so it's a RegExp: " + thing.toString());
	else
	console.log("It's a string of length " + thing.length);
	} else {
	// Here, TypeScript knows that thing is null\|number\|Date
	if (thing == null)
	<!doctype html>
	<html>
	<head>
	<style>
	p { font-family: serif; }
	table {
	border-collapse:collapse;
	}
	table td, table td {
	vertical-align: top;