Type Inference Basics: Build a Compiler That Understands Types

Have you ever wondered how modern programming languages know your variable types without you explicitly declaring them? Demystify the magic of modern type systems by building your own type-inferring compiler. Through clear, text-based lessons, you will transition from writing manual types to understanding how algorithms automatically resolve and validate types. You will build a foundational compiler engine that handles functions, variables, and complex expressions. What you'll learn: Understand the core concepts of type systems, static analysis, and type safety; Parse expressions and build Abstract Syntax Trees (ASTs) to represent code structure; Implement unification algorithms to resolve type constraints systematically; Map out type inference rules for functions, variables, and nested parentheses; Handle type errors and debug failing type checks within your compiler; Explore modern type system patterns used in industry-standard languages. The course begins with essential terminology and the foundational concepts of type theory. From there, you will read through step-by-step explanations of constraint collection, unification, and abstract syntax tree generation. This course is designed for curious developers and computer science enthusiasts who want to understand compiler design, with no prior compiler-building experience required. Start reading today to unlock the inner workings of modern programming languages.