TDictionary in Delphi is an extremely useful container, however the default method by which your 'keys' get hashed might be undesirable. Being able to alter this can give you far greater flexibility when taking advantage of the Generic Dictionary collection. You can watch the video on my channel (with keystrokes but without Q&A) or the Embarcadero version. This video is a replay from CodeRage X.
This book will make you a faster Delphi developer, it doesn't matter if you are just starting out, or have been using Delphi since version 1, you will find all sorts of tips, tricks and hacks to boost your productivity.