TypeScript Full Course for Beginners | Complete All-in-One Tutorial | 8 Hours

Introduction

This tutorial provides a comprehensive guide to learning TypeScript, based on an extensive course designed for beginners. You'll gain a solid understanding of TypeScript fundamentals and its application in React.js, with a focus on practical coding skills. This guide summarizes the key chapters of the course, offering actionable insights to enhance your web development skills.

Step 1: Getting Started with TypeScript

• Install TypeScript: Ensure you have Node.js installed. Use the command:

  npm install -g typescript
  

• Set up your environment: Download and install Visual Studio Code from here.
• Create a new TypeScript file: Save a new file with the .ts extension.

Step 2: Understanding Basic Types

• Learn about basic types:
  • string: Represents textual data.
  • number: Represents numeric values.
  • boolean: Represents true/false values.
• Example:

  let name: string = "John";
  let age: number = 30;
  let isDeveloper: boolean = true;
  

Step 3: Working with Arrays and Objects

• Define arrays: Use square brackets to define an array type.
• Define objects: Use an interface or type alias to define the shape of an object.
• Example:

  let numbers: number[] = [1, 2, 3];
  interface Person {
      name: string;
      age: number;
  }
  let person: Person = { name: "Alice", age: 25 };
  

Step 4: Creating Functions

• Function types: Define return types and parameter types for functions.
• Example:

  function greet(name: string): string {
      return `Hello, ${name}`;
  }
  

Step 5: Using Assertions

• Type assertions: Use assertions to specify the type of a variable when TypeScript cannot infer it.
• Example:

  let someValue: any = "this is a string";
  let strLength: number = (someValue as string).length;
  

Step 6: Implementing Classes

• Create classes: Use the class keyword to define a class.
• Example:

  class Animal {
      constructor(public name: string) {}
      move() {
          console.log(`${this.name} is moving.`);
      }
  }
  

Step 7: Exploring Index Signatures and keyof Assertions

• Index signatures: Allow you to define objects with dynamic keys.
• keyof operator: Get the keys of an object as a union type.
• Example:

  interface StringArray {
      [index: number]: string;
  }
  

Step 8: Working with Generics

• Generics: Create reusable components that can work with any data type.
• Example:

  function identity<T>(arg: T): T {
      return arg;
  }
  

Step 9: Utilizing Utility Types

• Common utility types:
  • Partial<T>: Makes all properties optional.
  • Readonly<T>: Makes all properties readonly.

Step 10: Setting up Vite.js with TypeScript

• Install Vite: Create a TypeScript project with Vite for fast development.
• Command:

  npm create vite@latest my-app --template vanilla-ts
  

Step 11: Building a TypeScript Project

• Integrate TypeScript: Use the knowledge acquired to build a simple project.
• Focus on structure and types for robustness.

Step 12: Integrating React with TypeScript

• Create a React project: Use Create React App with TypeScript template.
• Command:

  npx create-react-app my-app --template typescript
  

Step 13: Understanding React Hooks with TypeScript

• Implement hooks: Learn to use hooks like useState and useEffect with TypeScript.
• Example:

  const [count, setCount] = useState<number>(0);
  

Step 14: Using useReducer with TypeScript

• Implement useReducer: Manage complex state logic in React components.
• Example:

  const [state, dispatch] = useReducer(reducer, initialArg, init);
  

Step 15: Leveraging useContext with TypeScript

• Create context: Share values across components without passing props.
• Example:

  const MyContext = createContext<MyContextType | undefined>(undefined);
  

Step 16: Creating a React + TypeScript Project

• Build a project: Combine what you've learned to create a functional application.
• Focus on component types and props for clarity.

Step 17: Expanding Your React + TypeScript Project

• Enhance your project: Add more features, refactor for better types, and optimize performance.

Conclusion

By following this tutorial, you should now have a solid foundation in TypeScript, including its interplay with React. Make sure to practice by building projects and experimenting with the concepts learned. For deeper exploration, refer to additional resources provided in the course, and consider contributing to projects on GitHub. Happy coding!