The ECMAScript 2023 specification introduces new methods on the Array object that make it easier to write predictable and maintainable JavaScript programs. These methods, `toSorted`, `toReversed`, `toSpliced`, and `with`, allow for operations on arrays without mutating the original data, but instead making a copy and changing that copy. This change addresses issues with array mutations and side effects in React components. The new methods provide a more predictable way to work with arrays, especially when dealing with sorting, reversing, splicing, and modifying individual elements. Additionally, these methods can be used on any TypedArray, not just regular arrays. While there are some caveats and limitations to consider, the introduction of these new methods is seen as a positive addition to the ECMAScript standard, making it easier for developers to write more predictable code.