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To kickstart composition, we need to define a starting point — our top-level feature. We are able to easily get road store reference to a top-level state property by using createFeatureSelector.
Once we have that reference, we can then compose it with other selectors that point to state further down road store our feature state — effectively traversing the state tree till we get to a desired property.
We did something similar in one of the examples used cyclocross bike for sale a previous section using pure functions.
We start at the point where state is defined and road store ProductsState represents the feature state of this feature module.
It is composed of two other states that reside one level road store in the state tree: Rozd and ToppingsState. Our ProductsState is managed by our reducers an ActionReducerMap that contains two reducers — pizzas and toppings and each one manages the individual lower-level states, respectively.
Now we can introduce createSelector to obtain references to properties road store down our state tree — which allows us to ask for pizzas whenever we need in a simple way. Note how we pass www diamondback com as the first argument road store so we can begin our state lookup from this point.
And just like that, stord have access to a property located further down in our state tree.
The createSelector function takes up to eight selector bike commuting shorts as arguments, each one referencing different slices road store state. Notice how in the projector we are given s1s2 and s3 as the function arguments — in the order in which we supplied them.
This is far better than road store first example in the introduction where we had to nest function calls.
In short: The role of the projector function is a powerful one. We can ask for various state properties, anywhere within our state sstore, we can derive, transform or combine data from the state slices passed to it road store return this modified data as a single object — typically for component consumption.
Stoe to creating getPizzaStatein order to road store the pizza entities in our component we needed to do this:. However with our new found getPizzaState friend, we can now knock out one of the map calls:. These are state property selectors road store pure functions.
This is a great place to export all other properties of this state level so that we can easily compose them in the next level road store — which already has access to them through an import statement. Road store in our top-level reducer file, index.
We use fromPizzas. This is great, and exactly what we needed.
In the case of Angular, we can then ship it nicely into ngFor.
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