May 2019
Intermediate to advanced
496 pages
10h 38m
English
Content preview from Mastering React Test-Driven Development
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Refactoring long methods
After this, our handleSubmit function is a huge mess. I have counted 23 lines in my method; in the test-driven world, that is very long. Anything over five lines should be refactored (excluding our render function, which, for some reason, is generally accepted as long by default).
Refactoring handleSubmit into smaller methods is an exercise left for you; see the Exercises section. But here are some hints for how you can go about that systematically:
- Extract blocks into methods; in this case, that means the contents of if statements. For example, if there are no validation errors, you could call out to a performSubmit method, which actually does the submission.
- Look for temporal coupling and see if there are other ...
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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.