If you’ve ever needed to search an array from the end, you’ve probably reached for a combination of .slice().reverse().find(...), or looped backward manually. It works, but it’s not an elegant solution. We now have a better way: Array.prototype.findLast() and Array.prototype.findLastIndex(). These features let you search arrays from the end without...

There’s a good reason that many developers pause before using .sort(), .reverse(), or .splice() in JavaScript: those methods mutate the original array. That single side effect can lead to subtle, hard-to-trace bugs, especially in apps with shared or reactive state. The good news is that in the last couple of...

Promises have long been our go-to when working with asynchronous code in JavaScript. If you’ve used Promise.all() or Promise.race() to coordinate async operations, you know the patterns. But what if you’re only interested in the first successful result, ignoring failures? That’s exactly what Promise.any() does: it fulfills with the first...