What are the best practices for using rest parameters in JavaScript?

What are the best practices for using rest parameters in JavaScript?

Rest parameters allow you to represent an indefinite number of arguments as an array. Here are some best practices:

1. Use them when you need to handle multiple arguments.
2. Always place rest parameters at the end of the function's parameter list.
3. Combine them with default parameters for better flexibility.

Can you give me an example of using rest parameters?

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
``` This function takes any number of arguments and returns their sum.

What about performance considerations?

While rest parameters are convenient, be cautious with performance in tight loops or high-frequency calls, as they create an array each time. If performance is critical, consider using traditional arguments.

Are there any limitations I should be aware of?

Yes, rest parameters can only be used once in a function, and they must be the last parameter. Also, they cannot be used in conjunction with the arguments object.