If I had a nickel for every time I have used this pattern

... | perl -ne 'print "$1 $2 ...\n" if /some-regex-with-capture-groups/' | ...

No one has yet mentioned that the Design Patterns uses UML to elucidate its patterns. I think those diagrams work due to their limited scope. I hope those I have drawn with similar limits have helped others understand my and even their own designs.

Writing is used for understanding and for communication. These are two different activities. Ie, the prototype is not the product. Highly recommend the book Thinking on Paper, https://www.amazon.com/Thinking-Paper-V-Howard/dp/0688077587

> I find it inspiring that it has such readable and space-efficient interface, compared to current trends in many web apps.

Agree.

Always missed Pascal’s typed scalar ranges.

Undo and Save. Every application allowed you to reverse or abandon a change.