December 2015
Intermediate to advanced
240 pages
4h 57m
English
Content preview from Test-Driven JavaScript DevelopmentBecome 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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Implementing the observer pattern using TDD
We will see how we can use TDD to implement the observer pattern. We will use the red, green, and refactor life cycle of TDD to understand it in more detail.
Red step (code with error)
Let's try to add code, which has some dependency. Don't include dependency in the first step and see what error it's giving. Normally in the red step, we have some code with error, and then in next step we add proper code to make it green.
<script type="text/javascript"> Object.defineProperty(employee.status, 'Active', { get: function () { return inactive; }, set: function (status) { Object.getNotifier(this).notify({ type: 'update', name: 'Inactive', oldValue: inactive }); // Let's also print the value in logger anytime it ...Become 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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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.