Building a Calculator with Modern JavaScript

Every aspiring developer needs to master the core logic of UI state management, mathematical operations, and event handling. This text-based course guides you step-by-step through the process of building a robust calculator, helping you bridge the gap between basic syntax and real-world application structure. You will start with foundational programming concepts and essential terminology before diving into the core implementation details. By completing this course, you will transform your understanding of DOM manipulation, state tracking, and functional code design into a concrete project you can add to your portfolio. What you'll learn: - Understand foundational programming logic and calculator state management - Implement core mathematical operations cleanly using modern ES6+ syntax - Capture and process user input securely through event delegation - Structure your code with modern modules for better maintainability - Debug common logical edge cases like decimal handling and division by zero - Apply basic unit testing concepts to verify your calculation logic We begin with a clear breakdown of the application architecture, guide you through writing the foundational logic step-by-step, and conclude with refactoring your code using modern best practices. This course is designed specifically for beginners with basic HTML and JavaScript knowledge who want to practice building real applications. Start reading today to sharpen your development skills and build a solid foundation in functional application design.