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Exercise 01: TypeScript - Shape Calculation and Reporting

Solution Video

Introduction

In this exercise, you will practice:

  • Interfaces
  • Union Types
  • Functional programming
  • Typescript project structure

Goal

Implement a shape calculation and reporting system. The app will calculate the area and circumference of different shapes, including circles, rectangles, and triangles. You will then generate a shape report based on the calculated values.

Instructions

Step 1: Set up the project structure

  • shapes.ts: Define the interfaces for specific shapes and export the Shape type and the ShapeKind type.
  • calculations.ts: Implement the shape calculation functions and export the ShapeCalculator type, calculateArea function, and calculateCircumference function.
  • report.ts: Create the createShapeReport function that generates a shape report and export it.
  • index.ts: Use the implemented functions to calculate the area and circumference of shapes and generate the shape report.

Step 2: Implement the shapes.ts file:

  • Define the interfaces Circle, Rectangle, and Triangle for each specific shape. Each shape interface should have a kind property of a discriminated union type. Export these interfaces.
  • Define the Shape type as a union type of Circle, Rectangle, and Triangle.
  • Define the ShapeKind type as the mapped type that extracts the kind property values from the Shape type.

Step 3: Implement the calculations.ts file:

  • Import the Shape type from shapes.ts.
  • Define the ShapeCalculator type as a function type that accepts a shape of type Shape and returns a number.
  • Implement the calculateArea function that calculates the area based on the shape type using a switch statement. Export this function.
  • Implement the calculateCircumference function that calculates the circumference based on the shape type using a switch statement. Export this function.

Step 4: Implement the report.ts file:

  • Import the Shape and ShapeKind types from shapes.ts, and the ShapeCalculator type from calculations.ts.
  • Implement the createShapeReport function that takes an array of shapes and a shape calculator function. Iterate through the shapes using a for...of loop and generate an array of shape reports. Each shape report should have a kind property of type ShapeKind and a value property of type string, which represents the calculated value. Export this function.

Step 5: Implement the index.ts file:

  • Import the necessary types and functions from shapes.ts, calculations.ts, and report.ts.
  • Create instances of different shapes (e.g., circle, rectangle, triangle).
  • Create an array of shapes containing the instances created in the previous step.
  • Use the createShapeReport function with calculateArea to generate a shape report for the areas of the shapes. Iterate through the resulting array using a for...of loop and log each shape's kind and calculated area to the console.
  • Use the createShapeReport function with calculateCircumference to generate a shape report for the circumferences of the shapes. Iterate through the resulting array using a for...of loop and log each shape's kind and calculated circumference