During a project review, a colleague points out that a piece of code might have a performance impact due to creating a new scope each time it runs. Which type of function is being used: a regular function or an arrow function?

The piece of code that creates a new scope each time it runs is likely using an arrow function. Arrow functions capture the scope they are created in, which can lead to performance implications when they are used within loops or frequently called functions. Regular functions, on the other hand, do not capture the scope and may be more suitable for certain performance-critical scenarios.