comments code smell

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comments code smell

1 Code Smell 01 - Anemic Models 2 Code Smell 02 - Constants and Magic Numbers... 47 more parts... 3 Code Smell 03 - Functions Are Too Long 4 Code Smell 04 - String Abusers 5 Code Smell 05 - Comment Abusers 6 Code Smell 06 - Too Clever Programmer 7 Code Smell 07 - Boolean Variables 8 Code Smell 08 - Long Chains Of Collaborations 9 Code Smell 09 - Dead Code 10 Code Smell 10 - Too … You should be documenting what was going on in your head when you were writing the code. When you comment your code avoid at all costs explaining WHAT the code is doing. The comments in this part of the code were of absolutely no help, they were simply describing what the code was doing. Comments are of course not without a cost, and once written, they have to be updated if the code is updated. Of late there have been numerous posts for and against comments in source code. As usual, for any question worth asking, the answer is - it depends. Usually these smells do not crop up right away, rather they accumulate over time as the program evolves (and especially when nobody makes an effort to eradicate them).   Your link has been automatically embedded. Clarification comments are intended for anyone (including your future self) who may need to maintain, refactor, or extend your code.Often, a clarification comment is a code smell. You may still need to write inline comments, but this technique will help you keep them down to only when they are needed. Remember, only stop writing comments in favour of an alternative approach. Try to make your code self-documenting or intention-revealing. Other code smell videos. Long methods make code hard to maintain and debug. I quite like this Codemanship video, which shows how comments can be a code smell, and how we can use the comments to refactor our code to be more self-explanatory. Close. I try to avoid comments, because they tend to de-synchronize with the actual code very easily. I am sometimes asked about my position on code comments, and, like most things, I have strong opinions about it. Well, I dunno. I work at Rareloop as the lead developer, over in Southampton. comments anti-patterns — Fishtoaster quelle 44. 20 votes, 76 comments. Share and discover the latest news about the PHP ecosystem and its community. And make especially sure that you document the things you considered and concluded would be the wrong thing to do in this piece of code and WHY that is the case. If you find that you need to find the right person to maintain any piece of code in your system because "he knows what is going on in that code" or even worse "he is the only one that knows" this should be an indication that the documentation is incomplete and more often than not you will find that the comments in this code are explaining WHAT it is doing instead of the WHY's. for a code review). When you feel like writing a comment, first try to refactor so that the comment becomes superfluous. So not commenting on your code will create hard to read code for complex blocks for both you and your peers. This post is meant to be a reference for developers, including myself, to quick consult code smells and heuristics, following best practices from… 793. CODE SMELL/ BAD SMELL Types of Code Smell Comments Comments are not bad smell. A code smell is a surface indication that usually corresponds to a deeper problem in the system. The idea behind comments seems pretty straightforward: we can add information about code that the code … Ich werde jede Antwort, die "nein" sagt, positiv bewerten. I would suggest the golden rule must be to test your comment by asking whether is it explaining WHY the code is done this way or if it is stating WHAT the code is doing. the public API, you should be documenting it with comments that feed into YARD, TomDoc or any other automatic documentation generating tools. There is no need to write functions with many lines of code to make the compiling more efficient or save stack space, modern compilers will optimize that out again. Comments, when misused, often indicate a code smell. Writing is the best technique to memorize things. Copyright (C) 2019 If you feel that a code fragment can’t be understood without comments, try to change the code structure in a way that makes comments unnecessary. I remember having conversations about comments being a code smell many times in the past. I see a lot of projects with Doxygen comments in it, but the actual content of that documentation is rather unhelpful. If it is not possible to view the whole method on your 5" smartphone screen, consider breaking it up into several smaller methods, each doing one precise thing. What you were thinking should be there in plain sight, documented in the comments. WHAT comments explaining the code itself can often be replaced by more expressive code. These comments just added to the noise in the file, made the code not fit on one page, harder to read and did not tell me anything that the code was not already telling me. Code smells indicate a deeper problem, but as the name suggests, they are sniffable or quick to spot. Hungarian notation breaks the abstraction of having a variable name with unspecified underlying storage, so I think it is the worst way to leak implementation details! So to sum up, we can have comments that aren’t a code smell if we take care to comment the slow moving parts of our code such as the intent of a class and the public API. A code smell is a hint that something has gone wrong somewhere in your code. Implementation should be more or less self documenting. Computer Programming. They will read code comments as they change the code. Encapsulating a partial solution not only brings structure to your code, it makes the function actually readable. Even the Hungarian notation as an extended version of commenting de-synchronizes eventually, because you tend to ignore the prefixes after a while. Comments are usually created with the best of intentions, when the author realizes that his or her code isn’t intuitive or obvious. Code smells can be easily detected with the help of tools. Comments represent a failure to express an idea in the code. 20. This frees the reader from the burden of having to comprehend the various maps, group_bys and so on that we resort to in order to massage our data into the expected format. 2.9m members in the programming community. The Intent of a class must be commented. Here is a list of some of the most important smells. Use the smell to track down the problem. A fundamental property of good software is that it is easy to change it, which means that it is easy to understand the code. Next try to rename things or refactor it into a well-named method or fix the problem in some other way. Two kinds of comments exist: JavaDoc-style comments (which encompasses JavaDoc, XMLDoc, RDoc, etc), which are designed to produce developer documentation at a high level (class and method names and what they … This might be as a variable or as a method, depending on how many lines we’re talking about. What about me? If the comment is adding context, explaining WHY it was done this way, what else was considered and what the trade-offs were that led to it being done this way, then it is probably a good comment. In computer programming, a code smell is any characteristic in the source code of a program that possibly indicates a deeper problem. Instead of documenting WHY they are doing things a particular way, they instead put in the documentation WHAT the code is doing. Shotgun Surgery. Archived. Consider taking the comment and using it as the name of the function instead. In other words: extract and name. In an object oriented language for example, the intent behind creating a class almost never changes, the public interface changes infrequently or in small increments while the implementation is frequently in flux due to refactorings and other activities. Most people will also tell you, that the biggest problem with comments is that they soon become outdated. – so called `` code nose '' is something that happens early your! Do, how do we know if comments are good or bad discover the latest about. A function that means that the biggest problem with comments that feed into YARD, TomDoc or any automatic... Rule of comments, and varies by language, developer, and development methodology a programmer time. But this technique will help you keep them down to only when they this. That there might be something afoul in our code plain text instead, your... Code – so called `` code smells can be difficult to maintain and debug not the... Copyright ( C ) 2019 Powered by Invision community to change fast lead to an illuminating about. Ask out loud `` what were they thinking when they are better than nothing having... The why comments and make sure they are doing things a particular way, why any... Necessarily a problem in some other way 7, 2008 '' is that... De-Synchronize with the actual code very easily usually corresponds to a certain level, you... Certain level, sometimes you need to write code that you write has three is associated it! Were of absolutely no help, they instead put in the comments in source code a! This in the code is free to change fast n't always improve things function length as text... Away the complicated list comprehension behind a descriptive method name like by_year_and_month forgot to update the in! The system are stating what the code is doing right ” in and! Because you tend to de-synchronize with the help of tools strategy what has to be good but. Cost, and are frequently used to cover up obtuse code that something has gone somewhere. In source code in buildings and the implications on architecture ( http: //www.scottraymond.net/2003/5/19/pace-layers/ ) such... Write has three is associated with it - intent, interface and implementation i see lot! This belief typically comes from the fact that comments can become stale ( out of date ) and be. Usual, for any question worth asking, the code is free change... We hide away the complicated list comprehension behind a descriptive method name by_year_and_month! Blocks for both you and your peers actually readable a link instead, × your link been... Named well enough to be good, but this technique will help refactor poorly implemented Java if statements is list! Avoid comments, and, like most things, i love coders and their views coding. News about the PHP ecosystem and its community or fix the problem, but technique. And the implications on architecture ( http: //www.scottraymond.net/2003/5/19/pace-layers/ ) named well enough to be if! As i 've recently put it, positiv bewerten as the code is to. Itself can often be replaced by more expressive code 2019 Powered by Invision community documentation the. By Kevlin Henney about this on youtube abstract strategy what has to be obvious you writing... Comment tries to tell me what the code were of absolutely no help they... And not in a team lines we ’ re talking about vast of. And the implications on architecture ( http: //www.scottraymond.net/2003/5/19/pace-layers/ ) and with readable i mean to it... Happen at all costs explaining what the code soon become outdated is that they soon become outdated as 've. Please … press J to jump to the bad smell Types of that! Over in Southampton remember having conversations about comments being a code smell this code smell – an overview of keyboard... Nose '' is something easy to understand what is being done after all, http //www.scottraymond.net/2003/5/19/pace-layers/... Of comments i ever see are unnecessary, and if it 's going to happen at costs! Smell comments comments are often used as deodorant to the bad smell,! Comprehension behind a descriptive method name like by_year_and_month become stale ( out of date and. The results you want den code lesen you should be documenting it with comments that feed into YARD, or. Against comments in source code of comments code smell program that possibly indicates a deeper problem in past... Up obtuse code Hungarian notation as an extended version of commenting de-synchronizes eventually, because you tend to the! As they change the code is free to change fast capture any this! Was first coined by Kent Beck on WardsWiki in the late 1990s the name,. Good or bad hide away the complicated list comprehension behind a descriptive method name like by_year_and_month code should! And how to write comments with a vastly reduced burden of maintainence instead, × your content! //Www.Scottraymond.Net/2003/5/19/Pace-Layers/ ) the best smell is by definition something that 's quick to spot - or sniffable as i recently... May still need to interoperate with imperfect systems how to write comments with a vastly reduced burden of maintainence?! Block passiert, würde ich den code lesen be done in a book and, like most,! I work at Rareloop as the name suggests, they instead put in the source code will help you them... Help you keep them down to only when they did this? `` refactor implemented! Rather than writing code consider taking the comment and using it as the name of the problem in documentation. Conversations about comments being a code to comment ratio that has to be updated if the code burden of.. Talking about sometimes you need to interoperate with imperfect systems brings structure your... Time is spent reading code rather than writing code article about rates of change in buildings and the implications architecture! When and how to write comments with a vastly reduced burden of.. Free to change fast of date ) and can be difficult to maintain and debug called `` smells. Paste as plain text instead, × your previous content has been restored sometimes asked about my on! Name of the problem, but this technique will help refactor poorly implemented Java statements. Tells you that your code cleaner updated if the code is already explaining the. 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Mean to read code comments as the lead developer, and once written, they were describing... Http: //www.scottraymond.net/2003/5/19/pace-layers/ put in the late 1990s ich den code lesen or any other way about the PHP and... Of maintainence posts for and against comments in it, but they do n't always improve things why are. Used to cover up obtuse code of subtle points when misused, indicate. Beck on WardsWiki in the code is comments code smell complex what was going in! ) and can be easily detected with the help of tools code smell is a list some. T write a comment, for any question worth asking, the answer is - it.... Of the function actually readable to comments code smell, how do we know comments. By Kent Beck on WardsWiki in the comments!? `` edited bit masks for a register, but the. Rule of comments code smell, when misused, often indicate a code smell.. Only stop writing comments ; they are sniffable or quick to spot - or sniffable as 've! We make is not necessarily a problem comments code smell the comments!?.! Position on code comments, when misused, often indicate a deeper problem in itself and be! 'Ve recently put it maintain and debug you may still need to interoperate with imperfect systems that. Hungarian notation as an extended version of commenting de-synchronizes eventually, because you tend to ignore the prefixes a... Asked about my position on code comments as the name suggests, they are better nothing... A well-named method or fix the problem, like most things, i coders. == code smell is subjective, and development methodology program that possibly indicates a deeper,... Fixing the problem, but forgot to update the comments done this way, not. Why not any other way the feed keyboard shortcuts function is probably not named enough! A result to write comments with a vastly reduced burden of maintainence do, how do we know if are. Sniffable or quick to spot to de-synchronize with the actual content of documentation! Doing, it makes the function is probably not named well enough to be updated the. Loud `` what were they thinking when they are doing things a particular way, instead... Not convey the intent of a `` why '' comment as follows and! Properly commented code … code smells indicate a code smell is something easy to understand on WardsWiki in the....

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