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TypeScript - interface extends keyword

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In TypeScript it is possible to extend interface in following way.

1. extends keyword example

interface Shape {
    getName() : string;

interface Square extends Shape {
    computePerimeter(a : number, b : number) : number;
    computeArea(a : number, b : number) : number;

class LocalSquare implements Square {
    public getName() : string {
        return 'Square';

    public computePerimeter(a : number, b : number) : number {
        return 2 * a + 2 * b;
    public computeArea(a : number, b : number) : number {
        return a * b;

let square = new LocalSquare();

console.log(square.computePerimeter(2, 3));
console.log(square.computeArea(2, 3));



Run it online here

Note: Square interface extends Shape interface.

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