IIFE (Immediately Invoked Function Expression)

Improving code execution speed is NOT a common use case for IIFEs. IIFEs don't inherently make code run faster; in fact, function calls add a small overhead. The main purposes of IIFEs are: 1) Creating private variables and functions that don't pollute the global namespace, 2) Isolating variable declarations to prevent naming conflicts, 3) Creating closures that capture the current state for later use (especially in async operations), and 4) Implementing module patterns for better code organization. While there might be specific scenarios where using an IIFE leads to more optimized code patterns, performance improvement is generally not the primary motivation for using this pattern. IIFEs are more about code organization, encapsulation, and maintaining clean namespaces.