What is the point of macros?
One of the distinguishing features of Lisp and Scheme is the ability to define macros that allow you to extend the base language with new language constructs. Here are two examples what this actually means and why this is a good idea. Let's take a common idiom from Java: Whenever you want to open a file, process its contents, and close it again afterwards, you have to write code roughly like this:
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