[fsloth]

I've written software over a decade and I loath the design patterns book.

I would not give it to a beginner as it would corrupt their mind with useless drivel .

It's authors exhibit themselves as morons who celebrate renaming existing computer science concepts while occasionally mixing and matching them.

I would not be this uncharitable towards it if it was not such a famous (and hence harmfull) book.

It's harmfull because software engineering is really hard, and they just add up to the load by trying to have the reader memoize their junk instead of doing something that would actually make them a better programmer. And, if you try to use their concepts while programming - shudders, oh god help you.

I'm not going to iterate over every pattern. Here's an example:

Flywheight? You assholes, just tell memoization for what it is. Why don't you rename existing data structures as well? Good thing those come out of the box, otherwise you would have began the book by renaming array, linked list and dictionary. Maybe you would have called linked list "the chaingang" or something.

You don't simplify things by giving things cuddlier names. You stunt peoples growth that way.

Gang of four book is a malignant offshoot of the practice of attempting to make software engineering better by legalizing and dogmatizing it by decomposition into trivial details that hurt your brain. It's a branch of 'consultancy driven software development' where people attempt to aquire a halo of professionalism by calling things by fancy names and over-complex descriptions (while skipping the practical things with equally complex names but at least those weren't made up by a bunch of idiots).

[rhizome31]

While I agree that the GoF book is way overrated, I think you're being a bit harsh. Most of the patterns are actually tricks to overcome limitations of statically-typed class-based languages like C++ and Java. They can be useful in these languages but are not necessary with dynamic languages. Take Strategy for instance, with Python or JS, we'd just use a callback but in old Java you couldn't do that, hence the need for a more complicated technique. Creational patterns also mostly fall in this category. Some are so trivial (Template Method, Adapter), that it's hard to understand why they make them such a big deal.

Among the few patterns that are more generally useful and have stood the test of time, we'd find Composite, Command and of course Observer.

[voltooid]

Your comment is very interesting. I recently took a course on Design Patterns. I sat squirming during the lectures because I didn't like what was being said, but couldn't put my finger on what exactly I disliked.

What I understand from your comment is that you dislike the Gang of four book because it renames concepts that don't need the cutesy names that they give them. Do you have a problem with the _concept_ of design patterns? Or just the names they are given? Are the concepts themselves sound and worth paying attention to?

[fsloth]

I wrote a long rant as a response to another comment above. To quote myself:

"It reads like it was written by a clever, verbose, and 'over-eager novice."

Design patterns are a really usefull concept. The GoF book just totally botches up that concept by dwelving deep in trivial language details while missing the big picture.

Christopher Alexander's "A timeless way of building", and "Notes on the Synthesis of Form" are the books in architecture that prompted a lot of dicussion in software design circles, and from which I presume GoF got their idea of software design patterns.

What are good design patterns in software? IMO they are composed from the programming models exposed in a basic CS book like Aho and Ullman's "Foundations of Computer Science" and further developed in a books like Structure And Intrepretation of Computer Programs.

GoF is an ok anecdotal reference after those, but it really is not suitable as a didactic resource.

Peter Norvig wryly commented that 16 of the 23 pattern are either invisible or non-existent in lisp Lisp[0].

[0] http://www.norvig.com/design-patterns/design-patterns.pdf

[reacweb]

I do not like the GOF book. Some of the patterns appears sometimes in my code, but the book has never helped me to program better or helped me to think about my code. The single benefit I got from this book is that it gaves me words to explain my code to other people.

[beaconstudios]

your instinctual reaction against design patterns because you may have realised that design patterns are patches over flaws in the programming language's design - they're a terrible basis to build an architecture on. There's some discussion on this idea at the C2 wiki: http://wiki.c2.com/?AreDesignPatternsMissingLanguageFeatures

[JanisL]

Thanks for this post, I remember reading about "Flyweight" and being confused at the time, if it's just memoization that instantly makes sense and is just such a better way of describing things.

[sonnyblarney]

I disagree.

Design Patterns are very useful, but they are a tool like anything else.

They're not just a bunch of things with cutesy names, they are the most common and core patterns that we can use in OO.

Yes, they are way overused, particularly in Java, but they are useful.

The book could be summarized however.

[jl2718]

Everybody recommends it for no particular reason, and then I read one anonymous post ripping it apart in detail. I’m strongly inclined toward believing the latter and massively discounting most people’s opinion as unfounded, assuming they didn’t read it, and are just trying to convince others that they did. Is this the right way to think about this?

[rwnspace]

Being charitable, you could say at least part of the former are experiencing confirmation bias - that they enjoyed reading a different take on their existing knowledge - and cannot be arbiters of whether the book imparts anything useful to those without that knowledge.