Building Your Own Programming Language: Designing a Standard Library

Have you ever wanted to go beyond basic syntax and build a fully functional, usable programming language of your own? To make a language truly powerful, you must equip it with a standard library and an interactive environment where developers can run code instantly. This text-based course guides you through the foundational concepts of language design, focusing on standard library architecture, expression evaluation, and interactive shells. You will transition from parsing simple syntax to defining core functions and data structures that users expect out of the box. Through clear, written explanations and structured code examples, you will learn how to design helper functions, manage environment states, and implement an efficient Read-Eval-Print Loop (REPL). What you'll learn: - Understand the core architecture of a custom programming language standard library - Implement basic evaluation strategies to resolve expressions and manage variables - Build an interactive REPL from scratch to read, evaluate, and print user inputs - Design foundational library functions for math, string manipulation, and list processing - Apply modern clean-code principles to organize your interpreter or compiler codebase - Practice error-handling strategies to provide clear feedback during execution The course begins with fundamental terminology and language design concepts before moving step-by-step through the mechanics of evaluation, library design, and interactive environment creation. It is designed for intermediate programmers and curious beginners who have a basic understanding of programming logic and want to explore compiler and interpreter development. Start reading today and bring your custom programming language to life.