1 “... of the SOLID and DRY principles Add features using wrappers Redefine steps without altering the calling...”

2 “... without altering the calling sequence of an algorithm Use hooks in your application Convert a complex...”

3 “... opposite and the alternative of inheritance using object composition and wrappers. This part also...”

4 “.... This part also demonstrates the use of template methods, hooks, and facades in programming. Hints show you...”