Building a Go Phone Book App: CSV Data and Validation

Moving beyond basic syntax is the first major milestone for any aspiring Go developer. Real-world applications rely on persistent data storage, input validation, and efficient lookups to remain useful and reliable. In this text-based course, you will evolve a simple command-line utility into a robust phone book application. You will learn to store contacts in CSV files, perform fast lookups, and ensure data integrity using Go's standard library. What you'll learn: Understand foundational Go concepts including slice manipulation, maps, and modern error handling; Read and write CSV files efficiently using the standard encoding/csv package; Validate phone numbers and input formats using regular expressions; Implement fast memory lookups by indexing CSV data with Go maps; Structure your Go application using modern package layout and module conventions; Practice writing clean, idiomatic Go code with robust error checking. You will start by exploring core Go data structures and file I/O basics before diving into regular expressions for input validation. From there, you will integrate these components to build a fully functional, file-backed contact management system. This course is designed for beginner Go programmers who understand basic syntax and want to build practical, file-based applications. No advanced database experience is required. Start reading today to take your Go development skills to the next level.