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's at() method, introduced in ECMAScript 2022, simplifies array indexing by allowing negative indices for accessing elements from the end of an array, enhancing readability and reducing off-by-one errors. It also works with strings and typed arrays, making it a versatile addition for developers. The article discusses its advantages, edge cases, and browser support, along with a polyfill for legacy environments.