JavaScript Execution Context – How JS Works Behind The Scenes

JavaScript execution context refers to how JavaScript code is executed behind the scenes. Understanding the execution context is crucial for developers to comprehend how their code runs and interacts with the environment. In JavaScript, there are three types of execution contexts: global, function, and eval. The global execution context is the default context where code that is not inside any function is executed.
When a function is called, a new function execution context is created. This context includes the function’s arguments, local variables, and a reference to the outer lexical environment. Each function call creates a new execution context, forming a stack known as the “call stack.” The function execution context is popped off the call stack once the function finishes execution.
Additionally, the eval function in JavaScript creates a new execution context within the current context. It allows for dynamic code execution, although its use is generally discouraged due to security and performance reasons. Understanding these execution contexts provides insight into how JavaScript code is managed and executed, enabling developers to write more efficient and reliable