Instruction: Explain how and why you would use the map, filter, and reduce methods on arrays in JavaScript.
Context: This question evaluates the candidate's ability to work with arrays efficiently, showcasing their skills in functional programming techniques within JavaScript.
Official answer available
Preview the opening of the answer, then unlock the full walkthrough.
Map
The map method, as I've often employed it, transforms an array by applying a function to each of its elements and returning a new array without altering the original. For example, in building user interfaces, I've used map to convert an array of user objects into an array of JSX elements. It's a straightforward way to iterate over data and apply a transformation, ensuring that the UI stays in sync with the underlying data model....