What is the difference between the spread operator and rest parameter in JavaScript?

What is the difference between the spread operator and rest parameter in JavaScript?

The spread operator allows you to expand elements of an iterable, while the rest parameter collects multiple elements into an array.

Can you give me an example of the spread operator?

Sure! You can use the spread operator to combine arrays like this: const arr1 = [1, 2]; const arr2 = [3, 4]; const combined = [...arr1, ...arr2]; // [1, 2, 3, 4].

And how about the rest parameter?

The rest parameter is used in function definitions to gather arguments into an array. For example: function sum(...numbers) { return numbers.reduce((a, b) => a + b, 0); }.

So, can I use both in the same function?

Yes, you can! Just remember that the rest parameter must be the last parameter in the function definition.