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Now, let’s imagine that we want to track the mouse position in another component as well. Can we reuse any of the code from our <App> ?

In the createClass paradigm, the problem of code reuse was solved using a technique called “mixins”. Let’s create a MouseMixin that anyone can use to track the mouse position.

Problem solved, right?! Now anyone can simply “mix in” MouseMixin to their component class to get the x and y of the mouse in this.state !

Then last year, arrived and ultimately the React team decided to move away from using createClass to use them instead. It was a wise decision. Who wants to maintain their own class model when JavaScript already has one built-in?

But there was a problem: ES6 classes don’t support mixins . Also, besides the fact they aren’t part of the ES6 class spec, mixins have other shortcomings too, many of which discussed at length in a post on the React blog .

ES6 classes don’t support mixins

To summarize, problems with mixins are:

ES6 classes Indirection Naming collisions

So instead of using mixins, many in the React community eventually settled on an alternative technique for code reuse known as higher-order components , or HOCs. In this paradigm, code is shared using a similar technique to decorators ; you start with the component that defines the bulk of the markup to be rendered and then wrap it in more components that contain the behavior you’d like to share. Instead of mixing in the behavior you need, you can just decorate your component! 😎

decorators

It was a good solution that solved the problem of code reuse elegantly in the brave new world of ES6 classes, and the community adopted it in droves.

At this point I’d like to stop and ask: what did we gain by moving to higher-order components? Did we solve any of the problems we had with mixins?

Let’s see:

Another problem that both mixins and HOCs share is that they use static composition instead of dynamic composition . Ask yourself: where is the composition happening in the HOC paradigm? Static composition happens once, when the component class is created (e.g. AppWithMouse in the previous example).

a function is nullipotent if not calling it at all has the same side effects as calling it once or more

Here’s a list of the most commonly used HTTP methods and whether they are idempotent and/or safe as defined by the contract:

Idempotency and safety (nullipotentcy) are guarantees that server applications make to their clients and the world. It is a nike air max 95 women
standard that developers must adhere to
when implementing RESTful APIs over HTTP. An operation doesn’t automatically become idempotent or safe just because it is invoked using the GET method, if it isn’t implemented in an idempotent manner. A poorly written server application might use GET methods to update a record in the database or to send a message to a friend (I have seen applications that do this.) This is a really, really bad design.

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standard that developers must adhere to
automatically become idempotent

Adhering to the idempotency and safety contract helps make an API fault-tolerant and robust . Clients, middleware applications and various servers that requests pass through before reaching your application, use this contract for various optimizations . Clients may automatically cancel a GET request if it is taking too long to process and repeat it because they assume it has the same effect (since GET is idempotent). However, they won’t do the same thing for POST requests because the first one may have already altered some state on the server side. This is the reason why web browsers display a warning message that you are about to re-submit a form when you hit the back button to go to a form (For this reason, always redirect after a successful POST operation.) In the same veins, cache servers don’t cache POST requests and safe methods can pre-fetched to stored in cache to enhance performance.

Adhering to the idempotency and safety contract helps make an API fault-tolerant and robust use this contract for various optimizations

In summary, when building RESTful applications using HTTP, it is important to implement HTTP methods in a manner that satisfies their idempotency and safety contract, because clients and intermediaries are free to use this contract to optimize and enhance the user experience . Don’t use GET method for operations that alter the database and don’t use POST to retrieve information ( nike air max 1 premium quilted white purse WRCX1r
).

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pouvez vous me dire pourquoi depuis le début du jeux je n'est pas accées à mon camouflage zombie du pack division alors que tout fonctionne en multijoueurs et quand je joue en zombie et que je gagne des largages de ravitaillement zombie je ne peut pas les ouvrirs il ne sont pas affichées dans mes largages et ce depuis que j'ai le jeux pouvez vous me dire pourquoi j'ai ce genre de bugs je ne pense pas être le seul dans cette situation merci aux personnes qui prendront le temps pour me répondre merci

‎02-02-2018 08:34 AM

Hey there,

We are an English Support Team here and can only provide help in English. Please translate.

Regards,

‎02-02-2018 09:05 AM

Wow , that is really poor support... you know it takes two seconds in google translate if you aren't a native speaker, even if it isn't 100% accurate it will give you a good idea...

So lets see....

zombie: impossible to get my drops of delight ...can you tell me why since the beginning of the gameI do not have access to my zombie camouflage of the division pack whileeverything works in multiplayer and when I play zombie andI win zombie supply drops I can not open themit is not displayed in my drops and since I have the gamecan you tell me why I have this kind of bugsI do not think I'm the only one in this situationthanks to the people who will take the time to answer me thank you

There wasn't difficult was it? and it's a fairly decent translation

‎02-02-2018 10:26 AM

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