I clicked the link hoping for a critique of the ideas in SOLID and Clean Code, but what I got was an ironically long-winded critique of Bob Martin’s speaking style.
Martin and I have our differences, but this article isn’t really useful. Martin has a brand and a style. A lot of people find it engaging and entertaining. If you don’t, that’s fine, there’s plenty of other ways to learn about the ideas that are more concise.
Sorry if the title mislead you. To me criticizing SOLID and Clean Code directly is like beating a dead horse, so here I wanted to criticize the way they are presented because that's a big reason why it's successful.
If you want something real, look at Clean Code Horrible Performance youtube video if you haven't.
I also found Bob Martin entertaining, but after trying to follow his suggestions I just got into the trap that Casey Muratori shows: even if I don't care about the performance of the code at the start, the amount of abstractions Uncle Bob advises makes it just too easy to make the code extremely hard to optimize later.
What I dislike about the term "clean" code is that it dismiss objective criteria.
"I did it like that because it's cleaner" is a non sense. A program must be maintenable, efficient, observable, testable, scalable, performant, readable, secured. Each criteria can be objectively measured in a kind of radar diagram and can be maximized as long as it does not sacrifice another criteria. Form follows function.
Even "simple" (from KISS) is too vague, fortunately in the conference "simple made easy" Rich Hickey defines what is simple: not interleaved. simple comes from sin plex, the opposite of con plex. Not always easy to make something simple.
However I don't see anything wrong with SOLID. Separation of concerns is how a modern society or a football team works, and S brings D because specialization involves good relationships ("no man is an island" wrote John Donne
), and D is strongly related to L. I has no drawbacks.
However I don't separate data from business logic anymore (no data access layer). Business logic applies on data, not on objects that hide data. Translating a ER diagram into anemic classes while the DBA do the same in the DB does not have any value and forces to use obstruction pattern like repository. If entity classes have properties and methods (a Plane class that has a 'takeOff' and 'land' methods for instance) it is different but must most backend I see don't implement entity classes that way. Because their classes represent data, not animated concept. Player class with a shoot method might makes sense for a video game, User class with a addComment method for a CRUD app makes less sense to me.
Choose a convention and stick with it. Your chosen conventions could be the worst fit for your domain, but the code following "a" convention ensures that people jumping in later can actually follow along and it makes refactoring at least bearable.
I personally don't like when people stick to SOLID like it's the holy hammer, but nearly every serious programming language has a convention on how to write SOLID code, and it will be followed, which makes my job easier if I'm new to the codebase.
> For my part I'll just say that I have given due consideration to the points you've made, and while I disagree with your conclusions above, I have integrated several of your better ideas, as well as this entire document, into the second edition of Clean Code.
Bob can learn and change. Good for him. Can you? (you the reader, not the person I'm responding to - except when they by reading this comment are the same person)
Uncle Bob does a bad job talking about trade-offs, but there's still value in stuff like SOLID. The problems start when people blindly obey or ignore design principles.
Saying SOLID makes bad code is as over-simplistic as saying SOLID makes good code.
The trouble with SOLID is that it's mainly an artifact of old languages and paradigms.
3 of the letters are almost irrelevant in modern code, or barely worth thinking about most of the time.
So what's the value here? Single responsibility?
That kind of thing is now so known that it doesn't really need talking about, like you don't really need to endlessly discuss the database normal forms like people did in the 00s.
Concepts that are worth explaining to beginners, but most code will follow it by default.
Seeing it in job descriptions is more an indicator that a company has an inexperienced lead more than anything else.
If single responsibility is so well known, when did I just this week see some code that violated that from a senior engineer? That code past review by a couple other programmers, without me looking at it and pointing out how horrible it was.
Single Responsibility was written about nearly 40 years after cohesion was grafted into software design from an actual architect's (like buildings and cities, absolutely not software o doctoral thesis.
"That kind of thing is now so known that it doesn't really need talking about, like you don't really need to endlessly discuss the database normal forms like people did in the 00s."
Has humanity progressed so much that we no longer forget the lessons of the past?
That would indeed be a good thing but I am not so sure of it.
I guess by now it's pretty settled down and unanimous that SOLID is an extremely bad way to organize your code, and that Clean isn't very good and has about the same odds of helping or harming you.
But extending the complaint to all acronyms isn't helpful. ACID, OLAP, EBITDA, etc are perfectly good names with clear meanings that can be easily discovered.
While I agree the "Uncle Bob" cargo cult is IMO dumb, this really rubs me the wrong way:
> You have the vendor pushed acronyms like: ACID, CAP, OLAP, OLTP.
ACID and the CAP theorem in particular has _very_ serious consequences if you're doing anything that isn't a toy with a database, and if there was one thing worth beating into developers, it would be the consequences of those. With the big push on columnar stores and various flexible database options (and replication and etc.) understanding that OLAP and OLTP workloads have very different needs and performance profiles is also something that many (most?) developers seem to miss, and again seems like something that needs to be beaten into a huge cohort of developers. Just because there are some silly/stupid cargo cult acronym around process, does not mean that anything that's an acronym or is confusing to your _garden variety history major_ can just be dismissed. This is part of why we get a lot of the monstrosities that exist out in the world today; there's this really perverse behavior I've seen among people coming from somewhere other than the hard sciences to wave away formalism and anything that smells remotely like math as "oh they're just being dogmatic".
Oh please don't confuse it with an aversion to formalism. It's quite the opposite. ACID, CAP and others were fantastic research when they came up. But now they are outdated and reductive of the real implications of running databases and distributed systems. That's why I mentioned PACELC being one of my favorite design principles in this matter: https://en.wikipedia.org/wiki/PACELC_design_principle
My criticism of this "Acronym Marketing" is that software engineers get stuck rallying behind acronyms as if they were timeless but to me ACID and CAP are outdated and it would be better if engineers really got into the consequences of running complex systems as you said, and not only repeating acronyms as if they covered the whole story.
OLAP vs OLTP have become marketing talkpoints from Databricks and friends to get people into paying for managed distributed systems when in reality for plenty of workloads Postgres runs just fine. People get stuck in the dichotomy without getting a further understanding of the underlying technology.
Nothing of this is confusing to me. Its reductive.
Humans like acronyms. You see them all over. If it seems like programmers like them more than others it is only because you are in that field and don't think about other fields. (did you know that Radar, and Scuba are acronyms? probably most readers do as soon as I pointed it out but if asked to come up with a non-programming acronym would have used others)
These rules are all stuff that you probably should think about at some time. But they're often taught as strict rules, which I don't think is a good idea.
In the end many of them are still quite subjective. It is useful to try to avoid mixing unrelated stuff into the same class. But trying to religiously find the boundary to what a single responsibility means in each specific case is a waste of time.
Uncle Bob is a snake oil salesman. Not sure he realizes it himself though.
The whole SOLID, OOP design patterns era was one of the worst things to have happened to programming.
I always thought I was the one that sucked but now I'm absolutely certain that whole zeitgeist was total crap.
Pick better data structures such that you can use simple language elements to manipulate said data. If you're writing a dozen lines of code to abstract 2 lines of logic, you're not doing anyone any favors.
I read Clean Code when I was a beginner and found it revealing, but also annoying in parts, like the idea to 'do not use functions with more than 2 parameters.'
Re: Java classes called "SimpleFoo": that's usually because `Foo` is an abstract class or interface, and `SimpleFoo` is the version you actually use most of the time, unless you absolutely have to implement a `MyReallyComplexFoo` for some specific purpose.
Ahh interesting. So it's Java convention/best practices being ported to other languages. Nothing wrong with using "simple" that if you explain it that way. I stand myself corrected.
The only thing worse than a long-winded explanation that finally gets around to the topic you're interested in (in his case an explanation of SOLID) is a long-winded explanation that never gets around to it (in my case a refutation of SOLID).
To see really elegant and great code, I recommend looking in books. I have seen elegant code in: SICP, The Little Schemer, Software Design for Flexibility.
Problem is those are books. They are written by great programmers, but the problems are mostly toys - useful elegant examples, but the longest in SICP is still only a couple pages long. Sure it is cool they implemented SCHEME in a couple pages (you can tell how old the edition I have is), but if you wanted a real SCHEME implementation it would be much longer since you will want to spend a lot of time on optimization. If you want your SCHEME to be used it needs to have a standard library so that you don't have to write sort, trees, and all the other things we expect from a useful language. If you want this done in a reasonable amount of time you will need multiple programmers and in turn nobody will understand the full and so there will be some code that isnt' elegant.
Programming is human. Obviously there will be cultures (and cults) that spring up and die down all the time. I probably pissed off a few colleagues over the years by rejecting their arguments because they were “appeals to authority” that I did not recognize as authorities in the particular problems we were solving at the time. Hate cargo cult programming, but admit I fell into that trap often enough in my early years. Gotta start somewhere.
I am sorry but nothing in the article clearly lays out how solid/clean code doesn't feel solid or clean. It seems to be a criticism of a specific person. What am I missing?
> Software engineering culture is overly dogmatic and subjective.
It doesn't have to be. You can have standards without clinging onto them for dear life like you're about to be swept away in a flood.
> This is not a specific critique of the contents or ideas in SOLID or Clean Code. It’s about how it presents itself and how that made me feel.
Yeah, this blog post added to the dogma. Someone will read this and just look for something else to cling on to. For critique to work, you can't be injecting even more of your superficial opinion, and the readers have to care instead of impatiently looking for "the answer".
I clicked the link hoping for a critique of the ideas in SOLID and Clean Code, but what I got was an ironically long-winded critique of Bob Martin’s speaking style.
Martin and I have our differences, but this article isn’t really useful. Martin has a brand and a style. A lot of people find it engaging and entertaining. If you don’t, that’s fine, there’s plenty of other ways to learn about the ideas that are more concise.
Regardless of style, Uncle Bob's Enterprise Java Clean Code opinions are overly dogmatic and harmful in most places.
I pick and choose the bits I think make reasonable sense, an go with better options myself.
I felt the same. Even the off topic arguments don't many sense. Some sort of weird rant about acronyms that made no sense to me. Waste of time
Sorry if the title mislead you. To me criticizing SOLID and Clean Code directly is like beating a dead horse, so here I wanted to criticize the way they are presented because that's a big reason why it's successful.
If you want something real, look at Clean Code Horrible Performance youtube video if you haven't.
I also found Bob Martin entertaining, but after trying to follow his suggestions I just got into the trap that Casey Muratori shows: even if I don't care about the performance of the code at the start, the amount of abstractions Uncle Bob advises makes it just too easy to make the code extremely hard to optimize later.
https://youtu.be/tD5NrevFtbU?is=vuVfjbsINQrtfvbC
> [..] There’s plenty of other ways to learn about the ideas that are more concise.
Would you have any good resources to share?
You are not alone in his style, but in what he actually says, all of which seems to me to be wrong.
What I dislike about the term "clean" code is that it dismiss objective criteria.
"I did it like that because it's cleaner" is a non sense. A program must be maintenable, efficient, observable, testable, scalable, performant, readable, secured. Each criteria can be objectively measured in a kind of radar diagram and can be maximized as long as it does not sacrifice another criteria. Form follows function.
Even "simple" (from KISS) is too vague, fortunately in the conference "simple made easy" Rich Hickey defines what is simple: not interleaved. simple comes from sin plex, the opposite of con plex. Not always easy to make something simple.
However I don't see anything wrong with SOLID. Separation of concerns is how a modern society or a football team works, and S brings D because specialization involves good relationships ("no man is an island" wrote John Donne ), and D is strongly related to L. I has no drawbacks.
However I don't separate data from business logic anymore (no data access layer). Business logic applies on data, not on objects that hide data. Translating a ER diagram into anemic classes while the DBA do the same in the DB does not have any value and forces to use obstruction pattern like repository. If entity classes have properties and methods (a Plane class that has a 'takeOff' and 'land' methods for instance) it is different but must most backend I see don't implement entity classes that way. Because their classes represent data, not animated concept. Player class with a shoot method might makes sense for a video game, User class with a addComment method for a CRUD app makes less sense to me.
Choose a convention and stick with it. Your chosen conventions could be the worst fit for your domain, but the code following "a" convention ensures that people jumping in later can actually follow along and it makes refactoring at least bearable.
I personally don't like when people stick to SOLID like it's the holy hammer, but nearly every serious programming language has a convention on how to write SOLID code, and it will be followed, which makes my job easier if I'm new to the codebase.
For some actual code and comparison of principles behind Clean Code see:
https://github.com/johnousterhout/aposd-vs-clean-code
And at the end of that Bob says:
> For my part I'll just say that I have given due consideration to the points you've made, and while I disagree with your conclusions above, I have integrated several of your better ideas, as well as this entire document, into the second edition of Clean Code.
Bob can learn and change. Good for him. Can you? (you the reader, not the person I'm responding to - except when they by reading this comment are the same person)
Uncle Bob does a bad job talking about trade-offs, but there's still value in stuff like SOLID. The problems start when people blindly obey or ignore design principles.
Saying SOLID makes bad code is as over-simplistic as saying SOLID makes good code.
The trouble with SOLID is that it's mainly an artifact of old languages and paradigms.
3 of the letters are almost irrelevant in modern code, or barely worth thinking about most of the time.
So what's the value here? Single responsibility?
That kind of thing is now so known that it doesn't really need talking about, like you don't really need to endlessly discuss the database normal forms like people did in the 00s.
Concepts that are worth explaining to beginners, but most code will follow it by default.
Seeing it in job descriptions is more an indicator that a company has an inexperienced lead more than anything else.
If single responsibility is so well known, when did I just this week see some code that violated that from a senior engineer? That code past review by a couple other programmers, without me looking at it and pointing out how horrible it was.
Single Responsibility was written about nearly 40 years after cohesion was grafted into software design from an actual architect's (like buildings and cities, absolutely not software o doctoral thesis.
"That kind of thing is now so known that it doesn't really need talking about, like you don't really need to endlessly discuss the database normal forms like people did in the 00s."
Has humanity progressed so much that we no longer forget the lessons of the past?
That would indeed be a good thing but I am not so sure of it.
I guess by now it's pretty settled down and unanimous that SOLID is an extremely bad way to organize your code, and that Clean isn't very good and has about the same odds of helping or harming you.
But extending the complaint to all acronyms isn't helpful. ACID, OLAP, EBITDA, etc are perfectly good names with clear meanings that can be easily discovered.
You don't know many c# devs, then.
I have met exactly 1 developer that both followed the Microsoft recommended practices and didn't think they were bad.
He's legacy is making code brake even now.
> I guess by now it's pretty settled down and unanimous that SOLID is an extremely bad way to organize your code
Hardly. Not settled down, still less unanimous.
While I agree the "Uncle Bob" cargo cult is IMO dumb, this really rubs me the wrong way:
> You have the vendor pushed acronyms like: ACID, CAP, OLAP, OLTP.
ACID and the CAP theorem in particular has _very_ serious consequences if you're doing anything that isn't a toy with a database, and if there was one thing worth beating into developers, it would be the consequences of those. With the big push on columnar stores and various flexible database options (and replication and etc.) understanding that OLAP and OLTP workloads have very different needs and performance profiles is also something that many (most?) developers seem to miss, and again seems like something that needs to be beaten into a huge cohort of developers. Just because there are some silly/stupid cargo cult acronym around process, does not mean that anything that's an acronym or is confusing to your _garden variety history major_ can just be dismissed. This is part of why we get a lot of the monstrosities that exist out in the world today; there's this really perverse behavior I've seen among people coming from somewhere other than the hard sciences to wave away formalism and anything that smells remotely like math as "oh they're just being dogmatic".
Oh please don't confuse it with an aversion to formalism. It's quite the opposite. ACID, CAP and others were fantastic research when they came up. But now they are outdated and reductive of the real implications of running databases and distributed systems. That's why I mentioned PACELC being one of my favorite design principles in this matter: https://en.wikipedia.org/wiki/PACELC_design_principle
My criticism of this "Acronym Marketing" is that software engineers get stuck rallying behind acronyms as if they were timeless but to me ACID and CAP are outdated and it would be better if engineers really got into the consequences of running complex systems as you said, and not only repeating acronyms as if they covered the whole story.
OLAP vs OLTP have become marketing talkpoints from Databricks and friends to get people into paying for managed distributed systems when in reality for plenty of workloads Postgres runs just fine. People get stuck in the dichotomy without getting a further understanding of the underlying technology.
Nothing of this is confusing to me. Its reductive.
Humans like acronyms. You see them all over. If it seems like programmers like them more than others it is only because you are in that field and don't think about other fields. (did you know that Radar, and Scuba are acronyms? probably most readers do as soon as I pointed it out but if asked to come up with a non-programming acronym would have used others)
I was reflecting about this and it may be cultural. In spanish we do have some acronyms they are not as widespread as in english.
Also, DRY, WET, YAGNI are useful ideas.
Yep. That's what they are. Useful ideas. The issue is treating them as rules or excuses for early/unnecesary abstractions.
These rules are all stuff that you probably should think about at some time. But they're often taught as strict rules, which I don't think is a good idea.
In the end many of them are still quite subjective. It is useful to try to avoid mixing unrelated stuff into the same class. But trying to religiously find the boundary to what a single responsibility means in each specific case is a waste of time.
Uncle Bob is a snake oil salesman. Not sure he realizes it himself though. The whole SOLID, OOP design patterns era was one of the worst things to have happened to programming.
I always thought I was the one that sucked but now I'm absolutely certain that whole zeitgeist was total crap.
Pick better data structures such that you can use simple language elements to manipulate said data. If you're writing a dozen lines of code to abstract 2 lines of logic, you're not doing anyone any favors.
I read Clean Code when I was a beginner and found it revealing, but also annoying in parts, like the idea to 'do not use functions with more than 2 parameters.'
Re: Java classes called "SimpleFoo": that's usually because `Foo` is an abstract class or interface, and `SimpleFoo` is the version you actually use most of the time, unless you absolutely have to implement a `MyReallyComplexFoo` for some specific purpose.
Ahh interesting. So it's Java convention/best practices being ported to other languages. Nothing wrong with using "simple" that if you explain it that way. I stand myself corrected.
The only thing worse than a long-winded explanation that finally gets around to the topic you're interested in (in his case an explanation of SOLID) is a long-winded explanation that never gets around to it (in my case a refutation of SOLID).
I'm on 4G mobile, that stock photo of sheep is 19MB PNG file! Thanks.
To see really elegant and great code, I recommend looking in books. I have seen elegant code in: SICP, The Little Schemer, Software Design for Flexibility.
Problem is those are books. They are written by great programmers, but the problems are mostly toys - useful elegant examples, but the longest in SICP is still only a couple pages long. Sure it is cool they implemented SCHEME in a couple pages (you can tell how old the edition I have is), but if you wanted a real SCHEME implementation it would be much longer since you will want to spend a lot of time on optimization. If you want your SCHEME to be used it needs to have a standard library so that you don't have to write sort, trees, and all the other things we expect from a useful language. If you want this done in a reasonable amount of time you will need multiple programmers and in turn nobody will understand the full and so there will be some code that isnt' elegant.
The #1 problem of most clean code, or microservices, or other architectural patterns is taking a correct observation to a logical extreme.
Decomposition is good. Too much decomposition recreates complexity in the interactions.
Immutability is good. Immutability everywhere creates gymnastics with more mental load.
Extensibility is good. Extensible-everything is reduces usability.
Program isolation is good. Too much isolation melts your laptop into a Docker-shaped puddle.
Having the restraint to not apply your pet idea to everything under the sun is the mark of a mature programmer and indeed a mature person.
Programming is human. Obviously there will be cultures (and cults) that spring up and die down all the time. I probably pissed off a few colleagues over the years by rejecting their arguments because they were “appeals to authority” that I did not recognize as authorities in the particular problems we were solving at the time. Hate cargo cult programming, but admit I fell into that trap often enough in my early years. Gotta start somewhere.
I am sorry but nothing in the article clearly lays out how solid/clean code doesn't feel solid or clean. It seems to be a criticism of a specific person. What am I missing?
https://trolololo.xyz/software-evangelism-mess
I agree with the point about dogmatism, but I have so many other issues with this piece.
I mean... how do you even make the comparison between "A Handbook of Agile Software Craftsmanship" and "History of Hispanic Colonialism”!?
> Software engineering culture is overly dogmatic and subjective.
It doesn't have to be. You can have standards without clinging onto them for dear life like you're about to be swept away in a flood.
> This is not a specific critique of the contents or ideas in SOLID or Clean Code. It’s about how it presents itself and how that made me feel.
Yeah, this blog post added to the dogma. Someone will read this and just look for something else to cling on to. For critique to work, you can't be injecting even more of your superficial opinion, and the readers have to care instead of impatiently looking for "the answer".