Learn React with TypeScript 3

Chapter 2: What is New in TypeScript 3

1. We have the following function that draws a point:

function drawPoint(x: number, y: number, z: number) {  ...}

We also have the following point variable:

const point: [number, number, number] = [100, 200, 300];

How can we call the drawPoint function in a terse manner?

drawPoint(...point);

2. We need to create another version of the drawPoint function that can call by passing the x, y, and z point values as parameters:

drawPoint(1, 2, 3);

Internally in the implementation of drawPoint we draw the point from a tuple data type, [number, number, number]. How can we define the method parameter(s) with the required tuple?

function drawPoint(...point: [number, number, number]) {  ...}

3. In your implementation ...