Functions and Callbacks Questions

Covers the full set of core function concepts used in JavaScript and similar languages: functions as first class objects, function declarations versus function expressions, arrow functions, parameters and return values, and passing functions as arguments as callbacks. Includes higher order functions that accept or return functions, patterns for customizing behavior with callbacks, and common uses such as event handlers, iterator callbacks, and asynchronous callbacks. Also addresses related concepts often assessed together such as closures, function scope and hoisting, and the basic function execution context including the this keyword. Interviewers may probe understanding through examples, small code transformations, explaining behavior, and using these concepts to solve practical problems.