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?

1. 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?

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

1. We have a function called getData, which calls a web API to get some data. The number of different API resources is still growing, so we've chosen to use any as the return type:

function getData(resource: string): any {
  const data = ... // call the web API
  if (resource === "person") {
    data.fullName = `${data.firstName} ${data.surname}`;
  }
  return data;
}

 How can we make getData more type-safe by leveraging the unknown type?

1. What build flag can we use to determine which projects are out of date and need to be rebuilt without doing a rebuild?