Using default parameters in JavaScript functions provides fallback values when arguments are not supplied, creating more flexible and robust function interfaces. As the creator of CoreUI with over 25 years of JavaScript development experience, I’ve used default parameters extensively for API methods, configuration functions, and component initialization. From my expertise, the most effective approach is defining default values directly in the function parameter list using ES6 syntax for clean, readable code. This pattern eliminates the need for manual parameter checking and provides clear documentation of expected function behavior.