Environment Refactoring Martin Fowler Epub


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Read "Refactoring Improving the Design of Existing Code" by Martin Fowler available from Rakuten Kobo. Sign up today and get $5 off your first purchase. by Martin Fowler, Kent Beck (Contributor), John Brant (Contributor), William Existing Code shows how refactoring can make object-oriented code simpler and . Apr Download eBooks Refactoring to Patterns (PDF, ePub, Mobi) by Refactoring (eBook) Martin Fowler, Bob Books, Computer Books, Computer.

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the calibre library of Contribute to talebook/talebook-library development by creating an account on GitHub. Refactoring is a controlled technique for improving the design of an existing code base. Its essence is applying a series of small behavior-preserving. For the past two years, I've been working on a second edition of my book " Refactoring". Here I have details about the new edition and some memos describing.

For the past two years, I've been working on a second edition of my book "Refactoring". Here I have details about the new edition and some memos describing my thoughts in the last months of this project. The book is now available and you can buy it from informit the web presence of the publisher , Amazon , or your favorite book seller. Purchasing the book gives you access to the canonical web edition - which contains additional material that's not in the physical or ebook versions. It may take a while for the book to work its way through the various distribution channels.

This is one of those books. Each refactoring has a detailed recipe of its steps, and things go better when I open the book to follow those precise steps. Would you like to transform ugly code to make it better, but do so safely? Leave a comment below. Programming was fun when I was a kid. But working in Silicon Valley, I saw poor code lead to fear, with real human costs. Programming became fun again! I've now been doing TDD in Apple environments for 17 years.

I'm committed to software crafting as a discipline, hoping we can all reach greater effectiveness and joy. Hi, Finally received my copy of Refactoring. The hardcover somehow reminds me of the time I was in college. Enjoy the rest of the weekend.

Best, -Herman. Please log in again. The login page will open in a new tab. After logging in you can close it and return to this page. You are here: The Book that Changed Everything for Me.

If you've been wondering why I haven't been writing as much for martinfowler. The changes are both very minor and all-encompassing.

They are minor because the basic structure of the book hasn't changed. I begin with an opening example, a chapter of principles, a survey of "code smells", and an introduction to testing.

The Second Edition of "Refactoring"

The bulk of the book is a catalog of refactorings and of those 68 refactorings, all but 10 are still present, and I've added 17 new ones. Despite this lack of change in the overall book structure, the changes to the words on pages is huge. Every chapter and refactoring has been rewritten, mostly from near scratch. I rarely had decent opportunities to cut and paste text from the old edition.

The reorientation towards a less class-centered view is a large part of this. Although that may sound as simple as changing the name of "Extract Method" to "Extract Function", it did entail rethinking all aspects of every refactoring. I needed to reconsider the motivation, often feeling that it needed to be reframed. The mechanics needed at least a detailed review, often a complete rewrite. I wasn't keeping detailed notes on this, but my feel is that for every relatively simple import of an old refactoring, there were two that required a complete rethink.

However there is another change, which in a way isn't that important, but is bound to get a lot of attention. The examples are no longer in Java. When I choose a language for examples in my writing, I think primarily of the reader.

I ask "what language will help the most readers understand the concepts in the book? I picked Java because I felt the most people would be able to understand the code examples if they were written in Java. That was the case in , but how about in ? I considered using multiple languages, which would emphasize the language-neutral intent of the book. But I felt that would be more confusing for the reader, better to use a single language so they can get used to a consistent form of expression.

So which one would be the most approachable to readers? Such a language needed to be widely popular, among the top half a dozen in language popularity surveys. It really helps to have a C-based syntax, since most programmers would recognize the basic code structure.

Given that, two stood out. One was Java, still widely used and easy to understand. But I went for the alternative: Choosing JavaScript was deeply ironic for me, as many readers may know, I'm not a fan of it. It has too many awkward edge cases and clunky idioms.

ECMAScript ES6 introduced a rather good class model, which makes many object-oriented refactorings much easier to express, but still has annoying holes that are built into the fabric of the language from its earliest days. But the compelling reason for choosing it over Java is that isn't wholly centered on classes.

There are top-level functions, and use of first-class functions is common. This makes it much easier to show refactoring out of the context of classes.

The world-wide web has made an enourmous impact on our society, particularly affecting how we gather information. When I wrote the first edition, most of the knowledge about software development was transferred through print. Now I gather most of my information online. This has presented a challenge for authors like myself, is there still a role for books, and what should they look like?

I believe there still is role for books like this, but they need to change. The value of a book is a large body of knowledge, put together in a cohesive fashion. In writing this book I need to gather together lots of refactorings, and organize them in a consistent and integrated manner. But that integrated whole is an abstract literary work that, while traditionally represented by a paper book, need not be in the future.

Most of the book industry still sees the paper book as the primary representation, and while we've enthusiastically adopted ebooks, these are just electronic representations of an original work based on the notion of a paper book.

With this book, I'm exploring a different approach. I think of the canonical form of this book as the web site. The paper book is a selection of material from the web site, arranged in a manner that makes sense for print.

It doesn't attempt to include all the refactorings in the canonical book, particularly since I may well add more refactorings to the canonical web book in the future.

Our intention is that when you buy a copy of Refactoring, 2nd Ed, you might buy it at a bookstore in its physical form, or online in any form. The most essential thing you get for your money is permanent access to the web site. You can read the physical book, and access the web site whenever you need. This raises a question of what role ebooks such as epubs and kindle books should play.

There is a strong argument that they should contain all the information on the web site, after all physical size isn't a factor, and ebooks can be updated easily if I add new material. However the book industry doesn't think that way, they expect ebooks to have the same content as the physical books, so the ebook versions of refactoring will follow that principle, at least for now. There is somewhat of a shift away from a purely class-based structure but my aim has been not to change the scope of the book too much.

So I followed a rule of not letting the second edition venture into new topic areas. My general plan was take each refactoring in the first edition, and ask what needs to be done to it for it to be relevant in this slightly altered context.

In a few happy cases I could take the refactoring pretty much as it was, do a simple rewrite of the example into JavaScript, and be done with it. Usually however it required a significant rethink of the mechanics and the example.

Sometimes it meant the original refactoring was replaced by something similar. But I did explore some essays on using refactoring to help explore various architectural problems in and early I enjoyed writing them, and they indicated a vehicle I could easily use more in the future.

Early in February my editor at Pearson sent out the current state of the book to various people for a technical review. This is a vital part of the process for writing a book, any author will make mistakes, and I make plenty. Reviewers help catch those, and also highlight things that are not clearly explained.

When I started the book I gathered together a panel of people to do on-going review. Their feedback has helped enormously.

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But at some point I need someone to step back and take a fresh look at the whole book, which is where these recent reviewers have come in. Michael who has reviewed previous books for me feeds me lots of good suggestions for additional material that would take years to follow up on, so I have to let most of those go by. Michael is particularly good at this, he must have installed several compilers into his wetware, which is one reason why I find him such a good reviewer. William Chargin is challenging him however, so I feel doubly blessed.

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Clarifications are often the hardest to figure out. People will always have difficulties with bits of a book, trying to fix every individual difficulty would be cure worse than the disease - the book would have to be much bigger, and the prose would get so stilted that it would be tedious to read. An example of this was the way I laid out nested functions in the opening example confused three of the panel, so I knew I had to try a different approach. I always rather enjoy working through review comments.

This stage is particularly good as it forces me to step back too. Now I can look at the material as a whole, yet still dive down to sort out important details. That sounds rather convoluted, but there is a process here. Every candidate book submitted to the series is sent to all the authors in the series, and I ask for their opinion. In that case, they helped me decide to reject myself. This time they felt it was an easy inclusion, which reinforced my feeling that it was a good fit.

And there is some vacation in there, which I hope will help rejuvenate me a bit. This week was the week I finally got back to my desk in New England after five weeks on the road.

I had hoped to have finished the text before I went away, but there were still some review comments that needed work. I also got a final batch of comments just before I left. So this week I made my first pass through that final batch and now just have the outstanding todos from the reviews.


The good news is that I only have fourteen of them. I will hopefully get through them over the next two weeks before I have to hit the road again. Another topic on the book this week was starting to think about the cover. The core cover design is already settled, as it will be part of my signature series, but it does mean I have to pick a photo of a bridge.

As with last week, this week has seen me working on review comments so I can finalize the technical content of the book before starting the production process. I went through all the comments last week, doing all the easy ones that I could deal with in less than an hour or so. That left the complicated ones, which are pretty stressful to be working on at this late stage in the game, with a admittedly, somewhat self-imposed deadline staring at me. At the heart of my work this week is reworking two examples.

Both were ones where a couple of reviewers found difficult to follow, so I needed to figure out something that I think will be easier. I find code examples to be one of the most difficult aspects of my writing.

I try to create examples that are just complicated enough to show the main point, but no more complicated that that. The earlier example was particularly tricky as it was a section of a larger refactoring example, the future opening example of the book. This example divides into three phases, and reviewers indicated problems with the middle phase.

I reworked the sequence of the refactorings, and hopefully things are much clearer now. The essence of the change was to follow the now-written mechanics of this new refactoring, and I was happy to see that following these mechanics seemed to make it a good bit easier to do and understand. My aim is that they should work pretty well, most of the time. So I was pleased that following them helped me through this example. Reworking refactoring examples like this make me very familiar with git.

But doing this is tricky with refactoring, since I have a sequence of changes to the code. I then import the code into the book text with tags that indicate the ref of the commit, and the name of the code fragment.

The target still seems plausible, although much will depend on how the fifty lines I wrote today works as I write about the refactoring steps that go with it.

In the days of traditional publishing, this means that the author hands her manuscript over to the production team. At this point we expect no significant changes to the core material of the book. There will be changes: But the sense of crossing an important bridge is still there.

At some level, the book is done. Although, since this is a web-first book, I intend to continue to evolve its web representation.

I have a sense of relief, although there is still much to be done with the book, this is still a big milestone, a sign that my focus on the book will begin to wane. But it is some weight taken from my mind. When we started doing the signature series, the cover designer laid out the basic design which included space for a different photograph with each book.

I decided that these photographs should follow a theme for all the books in the series. At that time my wife, a structural engineer, was designing bridges; she has since moved from horizontals bridges and tunnels to verticals buildings. Her involvement in bridges inspired me to use them as a common theme for the book.

So whenever an author writes a book in my signature series, I ask them to choose a bridge to adorn the cover. Ideally the bridge should have some personal connection for them. The link was pretty clear - they built the bridge just down the road, during the same years that I wrote the book. For my second series book Domain-Specific Languages , I picked the Iron Bridge - this was a connection to the Black Country where I grew up, as well as a historically important bridge.

So what to choose for the Refactoring book? So instead my mind turned to a non-professional association. This immediately suggested picking one of the many attractive bridges that are on the carriage roads.

But I also thought of another Acadia-tinged possibility. On the road to Acadia we cross the Penobscot River. At the time that I wrote the first refactoring book, the road crossed the Penobscot using Waldo-Hancock Bridge , a suspension bridge designed by the notable bridge engineer David Steinman. In the first years of the new century, however, they found that the 70 year-old bridge needed to be replaced, and by the road went over the new Penobscot Narrows Bridge. On one of our trips up to Acadia, we stopped so I could take some photos of the two bridges.

BOBBI from West Virginia
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