Build a Frontend Web Framework (From Scratch) MEAP V05 by meap-version-5.html

Author:meap-version-5.html
Language: eng
Format: epub

Exercise 5.1

Imagine an application consisting in a counter and two buttons: one to increment the counter and another one to decrement it. It’s HTML could look like this:

<button>-</button> <span>0</span> <button>+</button>

When each of the buttons is clicked, what commands would you dispatch to the framework? Can you draw a diagram similar to the one in figure 5.5 that maps browser events to application commands?

5.1.2 The reducer functions

Reducer functions can be implemented in a few different ways, but if we decide to stick to the functional programming principles of using pure functions and making data immutable, instead of updating the state by mutating it, these functions should create a new one. This is illustrated in figure 5.6.

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