Building a Programming Language Interpreter from Scratch

Ever wondered what happens when you execute a line of code? Understanding the mechanics behind your favorite programming languages transforms you from a coder into a software engineer with a deep grasp of system architecture. This course takes you through the internal logic of programming languages, moving past simple syntax to explore how code is actually evaluated and executed. You will gain a foundational understanding of runtime semantics by reading through the construction of an interpreter that handles logic similar to modern dynamic languages. By the end of this course, the "magic" of how computers understand your instructions will be replaced by clear, engineering-based principles. What you'll learn: - Understand the fundamental differences between interpreters, compilers, and virtual machines. - Design an abstract syntax tree to represent program logic in a structured format. - Implement a runtime environment to manage variable scoping and state. - Apply recursive evaluation techniques to process mathematical expressions and control structures. - Build support for user-defined functions and modern closure-based lexical scoping. - Explore contemporary execution concepts including garbage collection basics and asynchronous patterns. The course begins with essential terminology and core definitions of language theory before moving into the practical architecture of a working interpreter. You will progress through written explanations and code examples that demonstrate how values and logic move through a system end-to-end. This course is designed for curious developers and students who have a basic grasp of data structures and want to understand the internal workings of the tools they use every day. No prior experience in language design or compiler theory is required. Start your journey into the world of programming language engineering today.