Questions

In order to cement what we have learned about TypeScript 3, have a go at the following questions:

1. We have the following function, which 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?

2. We need to create another version of the drawPoint function, where we can call it 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 type [number, number, number]. How can we define the method parameter(s) with the required tuple?

3. In your implementation of drawPoint, how can you make z in the point optional?

4. We have a function called getData, which calls a web API to get some data. The number...