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Essential Angular

You're reading from   Essential Angular Fast paced guide to Front-end web development with Angular

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Product type Paperback
Published in May 2017
Publisher Packt
ISBN-13 9781788293761
Length 108 pages
Edition 1st Edition
Tools
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Authors (3):
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Narwhal Technologies Inc Narwhal Technologies Inc
Author Profile Icon Narwhal Technologies Inc
Narwhal Technologies Inc
Jeff Cross Jeff Cross
Author Profile Icon Jeff Cross
Jeff Cross
Victor Savkin Victor Savkin
Author Profile Icon Victor Savkin
Victor Savkin
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Toc

Why?

Now, when we have understood how we had separated the two phases, let's talk about why we did it.

Predictability

First, using change detection only for updating the view state limits the number of places where the application model can be changed. In this example, it can happen only in the rateTalk function. A watcher cannot "automagically" update it. This makes ensuring invariants easier, which makes code easier to troubleshoot and refactor.

Second, it helps us understand the view state propagation. Consider what we can say about the talk component just by looking at it in isolation. Since we use immutable data, we know that as long as we do not do talk= in the Talk component, the only way to change what the component displays is by updating...

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