Let's wrap up our method-based refactoring strategies with the wrap method, a powerful technique for safely adding new behaviors to existing code. This technique allows us to enhance functionality without altering the original implementation, ensuring that we maintain the integrity of the existing codebase.

The wrap method enables the introduction of new behaviors to existing methods without modifying their original logic. This approach involves creating a new method that "wraps" the existing one, adding additional functionality before or after the original method is called. The key advantage of this technique is that it allows us to extend the behavior of a method while preserving its original functionality, minimizing the risk of introducing bugs.

When adding new behaviors, developers often face challenges such as the risk of breaking existing functionality and the difficulty of understanding complex codebases. Directly modifying existing methods can introduce bugs and make the code harder to maintain. The wrap method addresses these challenges by allowing us to add new functionality in a controlled manner, reducing the risk of unintended side effects.

To implement the wrap method, we start by extracting the original method logic into a new private method. This private method contains the core functionality that we want to preserve. Next, we create a new public method that wraps the private method, adding any new behavior before or after calling it.

Let's look at a code example to illustrate this process: