Type-Driven Development with Idris

Writing software that is guaranteed to be correct is one of the greatest challenges in modern software engineering. Idris solves this by bringing dependent types to functional programming, allowing you to express complex invariants directly in your type system. This text-based course guides you from the absolute basics of Idris syntax to writing programs that prove their own correctness. You will transition from treating types as simple labels to using them as active design tools that eliminate entire classes of runtime errors. What you will learn: • Understand types as first-class citizens and write functions on types • Implement dependent pattern matching to handle complex data structures safely • Prove properties like equality, decidability, and function totality directly in your code • Model real-world relationships and business logic using dependent types • Manage side effects cleanly using modern algebraic effect handlers • Apply quantitative type theory basics to track resource usage at compile time. You will start with foundational functional concepts and Idris syntax before moving into dependent types, interactive theorem proving, and effectful programming. This course is designed for developers with basic functional programming knowledge who want to explore dependent types. No prior experience with Idris or advanced type theory is required. Start reading today to unlock the power of type-driven development and write safer, more robust software.