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A community for learning and developing web applications using React by Facebook. Interested in building mobile apps using React Native?. Master the art of building modern web applications using React. Leverage frontend development skills to build impressive iOS and Android applications with React Native.

Any variable defined in a function with the same name as a global variable takes precedence over the global variable, shadowing it.

A new scope is only created when a function is created, because var does not have block scope, but function scope. Inside a function, any variable defined in it is visible throughout all the function code, even if the variable is declared at the end of the function it can still be referenced in the beginning, because JavaScript before executing the code actually moves all variables on top something that is called hoisting.

To avoid confusion, always declare variables at the beginning of a function. Using let let is a new feature introduced in ES and it's essentially a block scoped version of var. Its scope is limited to the block, statement or expression where it's defined, and all the contained inner blocks.

Modern JavaScript developers might choose to only use let and completely discard the use of var. Using const Variables declared with var or let can be changed later on in the program, and reassigned.

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Once a const is initialized, its value can never be changed again, and it can't be reassigned to a different value. We can however mutate a if it's an object that provides methods that mutate its contents. Modern JavaScript developers might choose to always use const for variables that don't need to be reassigned later in the program.

Because we should always use the simplest construct available to avoid making errors down the road. In my opinion this change was so welcoming that you now rarely see the usage of the function keyword in modern codebases.

Implicit return Arrow functions allow you to have an implicit return: values are returned without having to use the return keyword. The this scope with arrow functions is inherited from the execution context. An arrow function does not bind this at all, so its value will be looked up in the call stack, so in this code car.

Arrow functions cannot be used as constructors either, when instantiating an object will raise a TypeError.

This is where regular functions should be used instead, when dynamic context is not needed. This is also a problem when handling events. JavaScript has a quite uncommon way to implement inheritance: prototypical inheritance. People coming from Java or Python or other languages had a hard time understanding the intricacies of prototypal inheritance, so the ECMAScript committee decided to sprinkle syntactic sugar on top of prototypical inheritance so that it resembles how class-based inheritance works in other popular implementations.

This is important: JavaScript under the hood is still the same, and you can access an object prototype in the usual way. A class definition This is how a class looks. When the object is initialized, the constructor method is called, with any parameters passed.

A class also has as many methods as it needs. I am a programmer.

Inside a class, you can reference the parent class calling super. Static methods Normally methods are defined on the instance, not on the class. Getters and setters You can add methods prefixed with get or set to create a getter and setter, which are two different pieces of code that are executed based on what you are doing: accessing the variable, or modifying its value. Asynchronous means that things can happen independently of the main program flow.

In the current consumer computers, every program runs for a specific time slot, and then it stops its execution to let another program continue its execution. When a program is waiting for a response from the network, it cannot halt the processor until the request finishes.

Normally, programming languages are synchronous, and some provide a way to manage asynchronicity, in the language or through libraries.

Some of them handle async by using threads, spawning a new process. JavaScript is synchronous by default and is single threaded. This means that code cannot create new threads and run in parallel.

How could it do this with a synchronous programming model? The answer was in its environment. The browser provides a way to do it by providing a set of APIs that can handle this kind of functionality. More recently, Node. This event handler accepts a function, which will be called when the event is triggered: document.

One very common strategy is to use what Node. If there is an error, it contains some description of the error and other information. However every callback adds a level of nesting, and when you have lots of callbacks, the code starts to be complicated very quickly: window. How do we solve this?

Mastering React Native

How promises work, in brief Once a promise has been called, it will start in pending state. This means that the caller function continues the execution, while it waits for the promise to do its own processing, and give the caller function some feedback. At this point, the caller function waits for it to either return the promise in a resolved state, or in a rejected state, but as you know JavaScript is asynchronous, so the function continues its execution while the promise does it work.

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Cyber Security. Full Stack. Game Dev. Git and Github. Technology news, analysis, and tutorials from Packt. Stay up to date with what's important in software engineering today. Become a contributor. Go to Subscription. You don't have anything in your cart right now. React Native has completely revolutionized mobile development by empowering JavaScript developers to build world-class mobile apps that run natively on mobile platforms.

This book will show you how to apply JavaScript and other front-end skills to build cross-platform React Native applications for iOS and Android using a single codebase. This book will provide you with all the React Native building blocks necessary to become an expert.

Mastering React Native

You will learn to utilize form inputs in React Native. By the end of the book, you will be able to build cutting-edge applications using the React Native framework. Eric Masiello is a lead software engineer for Vistaprint Digital. Formerly, Eric worked as a principal frontend engineer for the Advisory Board Company and built mobile apps for the Education Advisory Board. He has taught frontend topics at General Assembly in Washington, D. Jacob Friedmann is a developer living in Seattle, WA.

He has been working as a developer professionally for 5 years and is currently a principal software engineer at AddThis, an Oracle company. At AddThis, he works on large front and backend applications.

He also builds mobile applications using React Native, including Audicy http: He has taught several classes, including frontend web development and JavaScript development through General Assembly in Washington D. Sign up to our emails for regular updates, bespoke offers, exclusive discounts and great free content. Log in. My Account. Log in to your account. Not yet a member?

Mastering React

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Mastering React Native. Leverage frontend development skills to build impressive iOS and Android applications with React Native. Are you sure you want to claim this product using a token? Eric Masiello, Jacob Friedmann January Quick links: What do I get with a Packt subscription?

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No notes for slide. Some of them handle async by using threads, spawning a new process. Quick links: Cyber Security.

While Node. I like the way you start with the smaller react project and I suppose we finish with a more complete app with more features like redux. Frequently bought together. In the past, when browsers were much less capable than today, and JavaScript performance was poor, every page was coming from a server.

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