The introduction of Array.prototype.findLast() and Array.prototype.findLastIndex() methods provides a more efficient and elegant way to search arrays from the end without reversing them. These methods simplify code, improve readability, and enhance performance, especially with large datasets, by eliminating the need for manual backward loops or array cloning.

JavaScript now includes safe, non-mutating array methods like toSorted(), toReversed(), and toSpliced() that help prevent bugs associated with mutating original arrays, especially in frameworks like React. These new methods return copies of arrays instead of altering them, enhancing code clarity and state management. Developers are encouraged to adopt these methods to improve their front-end workflows.