JavaScript Execution Context – How JS Works Behind The Scenes

JavaScript execution context is a crucial concept in understanding how JavaScript functions behind the scenes. It involves the environment where JavaScript code is evaluated and executed, with three main types of execution contexts: global, function, and eval. The global execution context is the default context for code outside functions, creating the top-level scope for globally declared variables and functions. Function execution contexts are generated when functions are called, establishing unique scopes for local variables and parameters within each function. Additionally, the eval function in JavaScript creates its own dynamic execution context by evaluating JavaScript code represented as a string. Understanding these execution contexts is fundamental to grasping JavaScript’s operational flow.

In JavaScript, every script operates within an execution context that dictates how the code is processed. The global execution context handles code outside functions, setting up the groundwork for global declarations. On the other hand, function execution contexts are specific to individual function calls, allowing for isolated scopes for local variables and parameters. The eval function introduces a dynamic execution context by evaluating JavaScript code in string