September 2016
Intermediate to advanced
270 pages
5h 16m
English
Content preview from Mastering PHP Design PatternsBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Tests fight legacy
Automated tests are the best tool to fight legacy code.
By having automated tests such as unit tests or behavioral tests, you are able to refactor legacy code effectively with confidence that little can be broken.
Badly written systems often consist of tightly coupled functions. One change to a function in one class may well break a function in a completely different class, leading to a domino effect of more classes being broken until the entire application is broken.
In order to decouple classes and follow practices such as the Single Responsibility Principle, refactoring must be carried out. Any refactoring effort must be sure not to break code elsewhere in an application.
This brings us onto the topic of test coverage: is it ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.