TypeScript provides several built-in data types to handle different kinds of values.

Functions in TypeScript are fundamental building blocks used to structure and reuse code. They are similar to JavaScript functions but offer optional static typing, which brings enhanced type safety, intellisense, and compile-time error checking.

In this chapter, you’ll explore one of the most fundamental aspects of TypeScript programming — operators. Operators are symbols or keywords that perform operations on variables and values, allowing you to create dynamic logic and expressions in your code.

In this chapter, you'll learn how to implement decision-making in TypeScript using conditional logic. The if, else if, and else statements allow your programs to respond dynamically based on various conditions. This is essential for building real-world applications where behavior changes depending on user input, system state, or other variables.

This chapter explores the various looping constructs available in TypeScript, including for, while, do...while, for...of, and for...in loops. You’ll learn how to execute code repeatedly, iterate over arrays and objects, and understand the differences between each loop type. The chapter emphasizes practical usage, syntax, and scenarios where each loop is most effective. With clear examples and explanations, you’ll gain confidence in controlling program flow and working with data collections efficiently in TypeScript.

TypeScript enhances JavaScript with robust object-oriented programming (OOP) capabilities through its class system.

In TypeScript, Advanced Types allow you to write more expressive, powerful, and type-safe code by combining and manipulating basic types.

Generics in TypeScript provide a powerful way to create reusable, flexible, and type-safe components. This chapter introduces the concept of generics and how they enable developers to write functions, classes, interfaces, and types that work with a variety of data types while preserving type information.

This chapter explores how TypeScript allows developers to organize, structure, and reuse code effectively using modules and namespaces. Modern applications are built by splitting logic into smaller, manageable files. TypeScript supports this through ES module syntax, enabling developers to import and export functionality across files in a clean, scalable way. You'll learn the syntax for defining modules, how to use named and default exports, manage dependencies through re-exports, and understand how module resolution works behind the scenes. Additionally, the chapter introduces namespaces—TypeScript's older method for grouping related code in the global scope—which is still useful in certain legacy or library scenarios. By the end of this chapter, you'll know how to structure TypeScript codebases using industry-standard modular techniques and when to use modules versus namespaces.

In this chapter, we'll explore how to configure TypeScript to suit different project needs and leverage various tools to enhance the development experience. TypeScript comes with a robust set of configuration options and works seamlessly with various build tools, editors, and debugging utilities. This chapter will guide you through setting up TypeScript, managing configurations, and integrating essential tooling.

This chapter explores key modern JavaScript features—such as Promises with async/await, destructuring, spread and rest operators, optional chaining, and nullish coalescing—that enhance the way we write TypeScript. Understanding these features helps you handle asynchronous tasks gracefully, write concise and readable code, and avoid common pitfalls related to accessing deeply nested properties or managing default values.

In this chapter, you will explore powerful, advanced features and design patterns in TypeScript that help build scalable, maintainable, and reusable codebases. These patterns go beyond basic types and syntax, unlocking the true potential of TypeScript’s type system and language capabilities.

In Chapter Error Handling and Debugging in TypeScript, we explore techniques to manage runtime errors, debug TypeScript applications effectively, and ensure robust code execution.

This chapter introduces how TypeScript can be used to interact with and manipulate the Document Object Model (DOM) in web applications. You’ll learn how to safely select and modify HTML elements, handle user events, and dynamically update the content and styling of a webpage using strongly typed and type-safe methods. By leveraging TypeScript's type system, you'll write cleaner, more maintainable, and less error-prone code when working with the DOM. This chapter also covers best practices for casting HTML elements and ensuring null safety when accessing them.