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Core Concepts: Structs, Enums, and Pattern Matching

Sat, 25 Oct 2025 00:00:00 +0000

Core Concepts: Structs, Enums, and Pattern Matching

As your programs grow, you’ll need ways to define custom data types that logically group related pieces of data. Rust provides structs and enums for this purpose. Combined with pattern matching, these features allow you to write expressive, robust, and type-safe code.

Structs

Structs are custom data types that let you name and package together multiple related values into a meaningful group. Each piece of data in a struct is called a field.

Chapter 6: Structs, Enums, and Powerful Pattern Matching

Fri, 20 Mar 2026 00:00:00 +0000

Introduction

Welcome back, Rustaceans! In our previous chapters, we laid the groundwork for understanding Rust’s core syntax, variables, and the unique concept of ownership. Now, it’s time to elevate our data modeling capabilities beyond simple scalars. Imagine trying to describe a person or a color using just individual i32s or Strings – it would quickly become cumbersome and error-prone.

This chapter introduces you to Rust’s powerful tools for creating custom data types: structs and enums. Structs allow you to group related pieces of data into a single, meaningful unit, much like objects in other languages (but without methods initially). Enums, short for enumerations, let you define a type that can be one of several possible variants, perfect for situations where a value can be either this or that.

Chapter 6: Combining and Refining Types: Unions, Intersections, and Enums

Fri, 05 Dec 2025 00:00:00 +0000

Chapter 6: Combining and Refining Types: Unions, Intersections, and Enums

Welcome back, intrepid TypeScript explorer! In our previous chapters, you’ve mastered the basics of declaring variables, defining functions, and creating your own custom types with type aliases and interface declarations. You’re building a solid foundation, and that’s fantastic!

Today, we’re going to unlock even more power and flexibility in TypeScript by learning how to combine and refine types. Imagine being able to say, “this variable can be either a number or a string,” or “this object must have the properties of both this type and that type.” That’s exactly what Union Types and Intersection Types allow us to do! We’ll also dive into Enums, a super handy way to define a set of related constants, making your code more readable and less prone to errors.

Chapter 8: Structures, Unions, and Enums: Custom Data Types

Mon, 03 Nov 2025 01:00:00 +0000

Chapter 8: Structures, Unions, and Enums: Custom Data Types

So far, we’ve worked with primitive data types like int, float, char, and arrays of these types. But real-world data is often more complex, requiring a way to group different types of information together. For instance, a Student might have a name (string), an ID (integer), and a GPA (float).

C provides tools to define your own custom data types:

Structures (struct): Allow you to group heterogeneous (different types) data items under a single name.
Unions (union): Similar to structures, but all members share the same memory location, allowing you to store different data types at different times in the same space.
Enumerations (enum): Provide a way to create named integer constants, improving code readability.

This chapter will teach you how to define, declare, and use these powerful constructs.

Guided Project 1: Command-Line Todo Application

Sat, 25 Oct 2025 00:00:00 +0000

Guided Project 1: Command-Line Todo Application

In this guided project, you’ll build a functional command-line todo application. This project will reinforce many concepts you’ve learned, including:

Structs and Enums for data modeling.
Ownership and borrowing.
Error handling with Result and Option.
File I/O for persistent data storage.
Basic command-line argument parsing.

Our todo application will allow users to:

Add a new todo item.
Mark an item as completed.
List all todo items (showing completed status).

We’ll store todo items in a simple JSON file.