ES2023 findLast() replaces inefficient reverse-then-find array workaround

JavaScript's ES2023 introduced findLast() and findLastIndex() as native array methods that search from the end of an array without copying or reversing it. Previously, developers used a spread-and-reverse workaround to locate the last matching element, which was memory-inefficient and harder to read. findLast() accepts the same predicate callback as find() but traverses the array backward in a single pass, returning the matching element or undefined if none is found. findLastIndex() complements it by returning the index of the last match, or -1 on failure, useful for slicing or splicing operations. Both methods have been supported across major browsers since 2022 and are fully typed in TypeScript 4.9 and later.