For a small number of operations, I prefer the traditional if-else approach, as a HashMap requires additional overhead for initialization.

However, for a larger set of operations, a HashMap lookup will be faster due to its O(1) time complexity, compared to the O(n) complexity of an if-else chain.

The choice depends on the number of operations. I'll stick with the traditional approach for now, and if the operations increase, I'll refactor as needed. This is why test coverage is important.