What is the real-world usage of the rest operator in JavaScript?

What is the real-world usage of the rest operator in JavaScript?

The rest operator allows you to represent an indefinite number of arguments as an array. It's useful in functions that need to handle multiple parameters.

Can you give me an example of how to use it?

Sure! Here's a simple example:

function sum(...numbers) {
    return numbers.reduce((acc, curr) => acc + curr, 0);
}

console.log(sum(1, 2, 3, 4)); // Output: 10

Are there any performance considerations when using the rest operator?

Generally, the rest operator is efficient, but if you're passing a very large number of arguments, it could impact performance due to array creation.

Can the rest operator be used in class methods?

Yes, the rest operator can be used in class methods just like in regular functions. It works the same way!