10/10/2019 Clean Code Pdf
Writing clean code from the start in thinga project is an investment in keeping the cost of change as constant as possible throughout the lifecycle of a software product. Therefore, the initial cost of change is a bit higher when writing clean code (grey line) than quick and dirty programming (black line).
I recently received this email from one of my blog readers:Does Adobe Acrobat have a feature similar to the eraser in the old MS Paint program to edit pdf documents? The feature does exist in ScanSoft Paperport (I have version 11). It is very useful to remove stray marks on scanned images, staple marks, fax headers, punched hole marks, etc.
If used with extreme zoom, I can remove just about any marks on the page so it looks like new. However, it would be useful to have all the features in one program. I prefer to use Adobe Acrobat to OCR, and otherwise manage PDF documents, but if they need editing I am forced to use ScanSoft Paperport. Also, the file size seems to go way up after I edit the document with Paperport.There are two ways you can clean up content in a PDF:. Use the Redaction tools (Acrobat Pro only) and redact using the 'No Color' option.See my for instructions. Use the Edit Image option and an external editor to clean up the PDFI’ve never written about the second option previously, so this seems like a good opportunity to do so!Using an external image editor makes the most sense for image-based PDFs. A quick way to remove extraneous marks in a scanned image without switching out of Acrobat is to use the Rectangle tool and then flatten the page.
I change the rectangle tool default properties to be all white with 100% opacity, and then just draw various rectangles over stray marks. I do so quickly over large areas of the screen, but your reader could easily zoom in and create small rectangles over even the tiniest marks. Once everything is covered, I’ll use the Flatten Comments and Annotations JavaScript to merge the white rectangles with the background. (Be sure to flatten the rectangles before trying to OCR or do other extreme manipulations of the pages, or the rectangles will realign themselves in the wrong places.).
By Martin FowlerRefactoring is a disciplined technique for restructuring an existingbody of code, altering its internal structure without changing its externalbehavior.Its heart is a series of small behavior preserving transformations. Eachtransformation (called a 'refactoring') does little, but a sequence of thesetransformations can produce a significant restructuring. Since eachrefactoring is small, it's less likely to go wrong.
The system is kept fullyworking after each refactoring, reducing the chances that a system can getseriously broken during the restructuring.guideRefactoring has grown into a well-known technique, andmost software development teams at least claim to be doingrefactoring regularly. Many teams, however, don't appreciate thedifferent workflows that refactoring can be used in, and thusmiss opportunities to effectively incorporate refactoring intotheir development activities. In this deck I explore various different workflows.I hope it will encourage teams to integrate refactoring moredeeply into their work, resulting in a better designedcode-bases that will make it quicker and easier to add newfeatures.8 Jan 2014infodeckby Pete HodgsonObservability in our software systems has always been valuableand has become even more so in this era of cloud and microservices. However,the observability we add to our systems tends to be rather low level andtechnical in nature, and too often it seems to require littering our codebasewith crufty, verbose calls to various logging, instrumentation, and analyticsframeworks. This article describes a pattern that cleans up this mess andallows us to add business-relevant observability in a clean, testable way.9 Apr 2019articleby Martin FowlerOften designs techniques are used to make a system more flexible, but end up being harder to work with.
One of the reasons is that explicitness is a property that often gets forgotten in design.Nov 2001by Martin FowlerGuidelines on when to make a new user defined type (or class) for values.Jan 2003by Martin FowlerA code smell is a surface indication that usually correspondsto a deeper problem in the system. The term was first coined by KentBeck while helping me with mybook.9 February 2006blikiby Martin FowlerOne of the most powerful tools in writing maintainable code isbreak large methods into well-named smaller methods - a techniqueKent Beck refers to as the Composed Method pattern.24 July 2009blikiby Martin FowlerIs it worth the effort to design software well?20 June 2007blikiby Martin FowlerDuring my career, I've heard many arguments about how long a function should be. Thisis a proxy for the more important question - when should we enclose code in its ownfunction?
Some of these guidelines were based on length, such as functions should be nolarger than fit on a screen. Some were based on reuse - anycode used more than once should be put in its own function, but code only used onceshould be left inline. The argument that makes most sense to me, however, is theseparation between intention and implementation.
If you have to spend effort intolooking at a fragment of code to figure out what it's doing, then you shouldextract it into a function and name the function after that “what”. That way when youread it again, the purpose of the function leaps right out at you, and most of the timeyou won't need to care about how the function fulfills its purpose - which is the bodyof the function.30 November 2016blikiby Martin FowlerSelf-Testing Code is the name I used in to refer to the practiceof writing comprehensive automated tests in conjunction with thefunctional software. When done well this allows you to invoke asingle command that executes the tests - and you are confident thatthese tests will illuminate any bugs hiding in your code.1 May 2014blikiby Martin FowlerTest-Driven Development (TDD) is a technique for buildingsoftware that guides software development by writing tests. It wasdeveloped by in the late 1990's as part ofExtreme Programming. In essence you follow three simplesteps repeatedly:5 March 2005bliki.
By Martin FowlerA common debate in software development projects is between spending timeon improving the quality of the software versus concentrating on releasingmore valuable features. Usually the pressure to deliver functionalitydominates the discussion, leading many developers to complain that theydon't have time to work on architecture and code quality. This debate isbased on the assumption that increasing quality also increases costs, whichis our common experience. But the counter-intuitive reality is that internalsoftware quality removes the cruft that slows down developing new features,thus decreasing the cost of enhancing the software.29 May 2019articleby Cade Cairns and Daniel SomerfieldModern web development has many challenges, and of those security is both veryimportant and often under-emphasized.
While such techniques as threat analysis areincreasingly recognized as essential to any serious development, there are also somebasic practices which every developer can and should be doing as a matter of course.5 Jan 2017articleby Martin FowlerWhen I write code that deals with external services, I find itvaluable to separate that access code into separate objects. HereI show how I would refactor some congealed code into a commonpattern of this separation.17 Feb 2015articleby Martin FowlerYou can use metadata based approaches to remove the pain from tedious data oriented tasks.Nov 2002by Martin FowlerKent Beck came up with his four rules of simple design while hewas developing in the late 1990's. I expressthem like this.2 March 2015blikiby Martin FowlerThe term 'command query separation' was coined by Bertrand Meyerin his book ' ' - a book that isone of the most influential OO books during the early days ofOO.
(The first edition is the one that had the influence, the secondedition is good but you'll need several months in a gym before youcan lift it.)5 December 2005blikiby Martin FowlerWhenever two or three values are gathered together - turn theminto a $%#$%^ object.- Me (it was funnier with the voices)This is one of my favorite s from the refactoringbook. You spot it when you constantly see the same few data itemspassed around together. Start and end are a good example of a dataclump wanting to be a.
Often dataclumps are primitive values that nobody thinks to turn into anobject.blikiby Martin Fowler(Here's an addition to your dictionary.)Detestable (adjective): software that isn't testable.16 March 2005blikiby Martin FowlerIn my view the is thebest book ever written on object-oriented design - possibly of anystyle of design. This book has been enormously influential on thesoftware industry - just look at the Java and.NET libraries which arecrawling with GOF patterns.blikiby Martin FowlerSoftware systems are prone to the build up of cruft - deficiencies ininternal quality that make it harder than it would ideally be to modify andextend the system further.
Technical Debt is a metaphor, coined by WardCunningham, that frames how to think about dealing with this cruft, thinkingof it like a financial debt. The extra effort that it takes to add newfeatures is the interest paid on the debt.21 May 2019blikiby Martin FowlerYagni originally is an acronym that stands for 'You Aren't GonnaNeed It'. It is a mantra fromthat's often used generally in agile software teams. It's astatement that some capability we presume our software needs in the futureshould not be built now because 'you aren't gonna need it'.26 May 2015bliki.
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