How JavaScript Works 🔥& Execution Context | Namaste JavaScript Ep.1
How Does JavaScript Work?
Understanding Execution Context
- The execution context is a fundamental concept in JavaScript, where all code execution occurs within a defined environment.
- This execution context can be visualized as a large box or container that holds everything necessary for executing JavaScript code.
Components of Execution Context
Memory Component
- The first component of the execution context is the memory component, which stores variables and functions as key-value pairs.
- This memory component is also referred to as the variable environment, indicating its role in holding all variables and functions.
Code Component
- The second component is the code component, where the actual code executes line by line.
- This part of the execution context is known as the thread of execution, emphasizing that it processes commands sequentially.
Synchronous and Single Threaded Nature of JavaScript
- JavaScript operates as a synchronous single-threaded language, meaning it can only execute one command at a time in a specific order.
- Each command must finish executing before moving on to the next line, reinforcing its synchronous nature.
Recap and Importance of Execution Context
- A recap highlights that everything revolves around the execution context: it consists of both memory (variable environment) and code components (thread of execution).
- Understanding these concepts is crucial for grasping how JavaScript works; they are often overlooked but essential for mastering the language.
Next Steps in Learning JavaScript
- Future videos will delve deeper into real-world applications of these concepts, including how to create an execution context and manage memory effectively.