123function getRange(max, min = 0, exclusive = false) {  // ...}

ypeScript also adds support for a final variadic ...rest parameter, which collects any extra arguments passed to the function into a single named array:

23function publish(topic, ...args):void {  // ...}

12var x, y;[x, y] = [10, 20];

any, number, string, boolean, and void (i.e. null or undefined)

TypeScript allows complex types

the properties of each object are compared

interface IPoint {  x: number;  y: number;} var point: IPoint;var point2: IPoint;

interface IPoint3d extends IPoint {  z: number;}