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hooks are a new addition in React 16.8. They let them use and use other reaction features without writing a class.
Create your own hook Here you can extract the component logic in reusable functions.
When we learned when using the effect hook, we have seen this component from a chat application that indicates a message indicating whether a friend is online or offline:
Now let's say that our chat application also has a contact list, and we would like to render names of online users with a green color. We could copy and paste a similar logic into our girlfriend component, but it would not be ideal:
You want to share this logic between friendship and FriSlistitem instead.
Traditional in the reaction we had two popular ways to share standard logic between components: rendering of props and components with higher order. We will now look at how hooks loosen many of the same problems without forceing them to add more components for the tree.
Extract a custom hook
Inside there is nothing new - the logic is copied from the above components. Just like in a component, make sure you only call other hooks that are unconditionally on the upper level of your custom hook.
In contrast to a reaction component, a custom hook does not have to have a specific signature. We can decide what it needs as arguments, and what if something should, then it should return. In other words, it is like a normal function. His name should always start using so you can see at a glance that the rules of the hooks apply.
The purpose of our useful status hook is to subscribe to the status of a friend. Therefore, as an argument, it takes a friendship and returns to whether this friend is online:
Let's see us now as we can use our custom hook.
with a custom hook
Initially, our declared goal was to remove the double logic from the components of FriendStatus and FriendlistItem. Both want to know if a friend is online.
Well, since we extracted this logic at a know-meeting status hook, we can use easy:
Is this code that meets the original examples? Yes, it works exactly in the same way. If you look closely, you will find that we have not made any changes to the behavior. All we have done was to extract a shared code between two functions in a separate function. Custom hooks are a convention that follows naturally from the design of hook instead of a reaction function.
Do I have to start my custom hooks, starting with "use"? please do. This convention is very important. Without it, we could not automatically check in violations of the rules of hooks because we can not see if a particular function contains calls to the hook.
Do two components with the same hook share state? Custom hooks are a mechanism to reuse essential logic (for example, setting up a subscription and remembering the current value), but each time you use a custom hook, All status and effects are completely insulated in it.
How is a custom hook an isolated condition? Each call on a hook becomes insulated state.Since we call directly, direct status, from the point of view of the reaction, calls our component on, simply usestate and entry. And as we have learned earlier, we can rush ourselves and are suitable for many times in a component, and they are completely independent.
Tip: Information between hook
Since hooks are functions, we can insist any information between them.
To illustrate this, we use another component from our hypothetical chat example. This is a chat message recipient picker indicating whether the currently selected friend is online:
We hold the currently selected friend ID in the RecIRDERD status variables, and update them when the user chooses another friend in the picker.
Since the call of the USESTATE hook call gives the latest value of the revision status variables, we can pass it on to our custom know-triff status hook as an argument:
We can know whether the currently selected -er friend is online.When we select another friend and update the recritide status variable, assigns our knowledge status hook to the previously selected friend and subscribe The status of the newly selected.
Custom hooks provide the flexibility of releasing the logic that was not possible in reaction components before. You can write custom hooks that take into account a wide range of applications such as form handling, animation, declaring subscriptions, timers, and probably even more we have not taken into account. In addition, you can build hooks that are just as easy to use the built-in functions of React.
Try to withstand the addition of abstraction too early. Now these function components can do more, it is likely that the average functional component in your codebase becomes longer. This is normal - do not feel like you you have to split immediately into hooks. However, we also recommend you to start the spotting cases where a custom hook hide a complex logic behind a simple interface or unwind component.For example, maybe you have a complex component that contains a lot of local condition managed on ad hoc style. USESTATE makes no easier to centralize the update logic, so you prefer to write it as a redux reducer:
-Minder are very convenient to test isolated and scaled to express complex update logic. You can break them away in smaller reducing if they are remotely. However, you may also enjoy the benefits of using the local state or may not want to install any other library.
What if we could write a user hook with which we can manage the status of locally of our component with a reducer? A simplified version of it can look like this:
We could now use it in our component and driven the reducer its state administration:
The need to manage the local state with a reducer in a complex component is customary that we have built up the user manufacturer hook directly into the reaction. You will find it together with other built-in hooks in the hook API reference.
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