What are the use cases for spread and rest operators in JavaScript?

What are the use cases for spread and rest operators in JavaScript?

The spread operator (...) allows you to expand elements of an iterable, while the rest operator collects multiple elements into an array. They are useful in various scenarios.

Can you give me some examples of how to use them?

Sure! For the spread operator, you can use it to merge arrays: const arr1 = [1, 2]; const arr2 = [3, 4]; const merged = [...arr1, ...arr2]; For the rest operator, you can use it in function parameters: function sum(...numbers) { return numbers.reduce((acc, num) => acc + num, 0); }.

Are there any performance considerations when using these operators?

Yes, while they are convenient, using them on large arrays can lead to performance issues due to the creation of new arrays. It's best to use them judiciously.

What about their compatibility with older browsers?

The spread and rest operators are part of ES6, so they may not be supported in older browsers. You can use Babel to transpile your code for compatibility.