In this module, we will dive into the creation phase of JavaScript's execution context, breaking down the internal processes of how the engine sets up variables and functions. You'll explore the critical role of the Realm Record, Environment Records, and other key fields in this phase. Through practical examples, you'll gain a deep understanding of how JavaScript organizes and manages execution contexts to handle your code effectively.

In this module, we will explore the execution phase of JavaScript’s execution context, focusing on the call stack and how it manages the execution of code. Through detailed examples, you'll gain insights into how function execution contexts are formed and executed. By the end, you'll be able to follow code execution step-by-step, understanding the inner workings of JavaScript at runtime.

In this module, we will focus on the differences between VAR, LET, and CONST, as defined by ECMAScript, and explore how they function in relation to block scope. You'll learn the specific rules around redeclaration, especially for LET, and understand how block-level scope works with practical examples. By the end of this section, you'll have a solid grasp of how these variable types interact with blocks in JavaScript.

In this module, we will introduce the concepts of lexical and dynamic scoping, explaining their key differences. Through examples, you'll see how JavaScript uses lexical scoping to determine variable resolution and how this contrasts with dynamic scoping, particularly in the context of Bash. By the end, you'll be able to understand and navigate scoping rules in both languages.

In this final module, we will wrap up by discussing immutability with CONST, exploring how Object.freeze() can help achieve true immutability in objects. You'll also review the use cases for VAR in today's JavaScript environment, ensuring you understand when and why to use it. The module concludes with a summary of key concepts covered throughout the course.