🔥 JavaScript Interview Series(10): Functional Programming — map, reduce, filter Explained

JavaScript interviews often test functional programming knowledge, particularly array methods like map, filter, and reduce. These methods enhance code clarity and maintainability. Map transforms arrays, returning a new array with modified elements. Filter selects elements based on a condition, creating a subset. Reduce condenses an array into a single value through an accumulator function. Developers are tested on understanding the core difference between the methods and how to implement them. Interviewers also probe how to remove falsy values using filter and the structure of reduce's callback function. Questions cover chaining map and filter, and also demonstrate a strong grasp of data transformations. Using map/filter/reduce can optimize code to avoid intermediate array creation. These methods align with functional programming by promoting pure functions.