Underrated JavaScript Array Methods That Deserve More Love ❤️

When it comes to JavaScript, arrays are a powerhouse. Developers often rely on popular methods like .map(), .filter(), and .reduce(). However, there are some lesser-known array methods that deserve your attention. These hidden gems can make your code cleaner, more efficient, and even more fun to write. Let’s dive into these underrated JavaScript array methods!

copyWithin() — The Cloning Ninja

Ever wished you could duplicate part of an array and reposition it within the same array? That’s exactly what .copyWithin() does! Unlike .slice() or .splice(), this method doesn’t create a new array—it overwrites the original.

array.copyWithin(target, start, end)

• target: Index to start copying to.
• start: Index to start copying from.
• end: Optional. Index to stop copying (non-inclusive).

Example

const numbers = [1, 2, 3, 4, 5];
numbers.copyWithin(0, 3);  
console.log(numbers);  // Output: [4, 5, 3, 4, 5]

reduceRight() — The Reverse Engineer

You know .reduce(), but have you tried .reduceRight()? Instead of iterating from left to right, .reduceRight() starts from the last element and works backward.