Delphi Cookbook - Third Edition

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Duck typing is a very broad topic and allows you to do wonderful things with a few lines of code. In this recipe's code, there is a bonus recipe project called DuckTypingUsingRTTIExtended.dproj, which contains an advanced version of the base recipe. It uses a fluent interface, allows you to select the components that you want to change, and defines what type of change to make on those components; something similar to the following code snippets. Set all the Caption properties of the components on the form to On All Captions:

Duck(Self).All.SetProperty('Caption').ToValue('On All Captions'); 

Set all the Text properties to 'Hello There' for the components with a name starting with 'Edit', using an anonymous method as a filter ...