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A Complete Guide to React Components
React component usually represents a small section of the user interface on a webpage. A React component's primary responsibility is to render and update its user interface whenever its internal state changes. Along with rendering the UI, it also controls the events related to that UI. To sum up, the react create component offers the following features.
● An interface's first rendering.
● Processing and managing occurrences
● Regularly updating the user interface when the internal state is changed
This article by Kanak Infosystems provides a complete guide on react components, their examples, types, and other information.
What are React Components?
React Components are reusable and are independent too. They serve as the foundation for all React applications. React creating components accomplish the same thing as JavaScript functions, except they operate independently to produce JSX code that serves as UI elements.
When it comes to forms, there are four types of react components.
1. Functional Component React
2. Class Components React
3. Pure Components
4. Higher-Order Components
1. Functional Components React
Functional Components are functions that accept arguments and output JSX. They lack state or lifecycle methods by default; however, React Hooks are used to add these features. Information display typically uses functional components.
They are simple to test, read, and debug. The best part is writing a JavaScript function allows us to build a functional React component.
2. Class Component React
Class components are pretty much the most employed among the four react components. One of the reasons is that the class components can conduct things functional components do. Class components react using props, state, and lifecycle methods.
The developer has to create a class and extend the React Component Class. For example, you create an employee component which will return the employee details to the users.
While the class components can cooperate, your application's functional components are unaware of other components. It is possible to pass the Data from one class component to another. To develop class-based components for React, developers usually use JavaScript ES6 classes.
Also Read: Class Components vs. Functional Components in React: Everything You Need To Know
3. Pure Components
Pure components are superior in terms of functionality. For pure components to shine, they should only return render functions. However, you must comprehend what a pure component accomplishes. The component is pure if the it provides the same output for the same props and state.
The primary purpose of pure components is to offer optimizations. Interestingly, they don't rely on or affect elements outside its purview. For this reason, pure components can replace essential functional components.
However, one significant distinction between a conventional React Component and a React Pure Component is the shallow comparisons that pure components make when a state changes.
4. Higher-Order Components
Higher-order components (HOC) are an advanced React approach for component logic reuse. The API does not contain a React component for it.
Higher-Order Components act as the pattern that grows out of the compositional nature of React. HOCs are fundamental functions that return a component (s). They are used to communicate logic to other parts.
About React Arrow Function Component
Developers prefer creating a react component over function keywords using all arrow functions. Creating components using the arrow function is easier, and the code is straightforward to understand.
Additionally, it has the advantage that regular functions handle this context dynamically, whereas arrow functions handle it lexically.
About the React Stateless Function Component
The primary purpose of the React Stateless Function Component is to focus on the UI. Methods like state or lifecycle methods are absent from stateless functional components. It is simple to create, and other developers can quickly comprehend it.
There is no need to have any concern about this keyword. Performance has increased since we no longer have to worry about managing the state.
A Brief on the React Function Component: State
Since developers now have React 16, they can construct a state and keep the form inside the vital functional component. One of the reasons for making this happen is React Hooks, a brand-new feature that lets us "hook" functionality into functional components.
The useState () hook helps create the state and formation and is one of the fundamental hooks offered by React. Developers can use array decomposition to extract the two crucial components from the collection—the state's current value and a function used to update the form—from the useState () function, which accepts an object as an input and returns an array.
A Brief on React Function Component: Event Handler
React gives us the same ability as JavaScript to call functions and run code when a user interacts with DOM components. These interactions are known as events in a technical sense; there are various kinds of interactions, including clicks, keyboards, mouse, etc.
There are different markups and methods for every component in React. The return () method of the component is called the code.
React uses camelCase syntax for all events and executes the handler method inside the braces. These are the two key distinctions in how React handles events.
Brief on React Function Component: Callback Function
Every component's function is regenerated when re-rendered, so the references to these functions vary between renders. A memorized instance of the Callback will be returned by use Callback (Callback, dependencies), and it will only change if one of the dependencies has changed.
We can reuse a similar function object among the available renders rather than create a new one for each new render.
Brief on React Function Component: Lifecycle
If you used the React class-based components, you used the React lifecycle method, including componentDidMount, componentWillUnmount, componentDidUpdate, etc., if you have previously utilized class-based React components. It is also feasible to employ the behavioral lifecycle methods under the functional components through the introduction of React 16.
· Mounting in the React Component Lifecycle: The class component is typically inserted into the DOM during the mounting lifestyle phase. Such a lifecycle method runs after the component has been mounted.
· Updating in the React Component Lifecycle: You need to use the componentDidUpdate() after the rendering method. The developers can be interest with the non-reactive environment in this phase.
· Unmounting in the React Component Lifecycle: Similar to the mounting, you need to use unmounting component to before removing a component from the DOM.
· React Component Lifecycle with Hooks: Instead of using the componentDidMount, componentWillUnmount, and componentDidUpdate, you can use the useEffect hook to achieve the same result.
The componentDidUpdate() render method is called right after the updating happens. This one is called always except for the initial render. That’s a good place to interact with a non-reactive environment. It’s a good idea to make HTTP requests here.
Brief on React Function Component: Export and Import
The components are the fundamental parts of ReactJS applications, and you can import the components from JavaScript to create a React component.
Similarly, you can also export the components to the other JavaScript files from your ReactJS code. For each component, you will find default import and export features.
There is at least one default export for each component. The path and keyword import the default export directly from the file.
React Function Component: Proptypes
React uses Proptypes as its internal type verification mechanism for react components. React components utilize this specific property to configure type verification.
Proptypes also called "props" or "react function components," are essential in passing information from one component to another. In other words, props are the parameters of the React Function Component. While the component may remain generic, we determine what it should render from the outside.
You can give props as HTML attributes when using the React component when it is rendering. The props object is then available as a parameter in the function signature in the Function Component.
React Function Component: Typescript
TypeScript is a popular enhancement for all JavaScript applications. You can use this JavaScript superset for your ReactJS coding to indulge into static typing. You can define and use the variables as you do on Java or C# by using TypeScript.
How to use React Functional Components?
Using react functional components can help to generate and preserve the state. React functional components are best for implementing lifecycle methods.
To handle the events, we can use react functional components. To import and export the functional components, we can use react functional components.
By utilizing call-back, developers can use react functional components to transfer data from parent to child and from child to parent components. The functional components of react can be used for a huge variety of tasks.
Conclusion
Thanks to the launch of React 16, using hooks, developers are able to perform so many things with react functional components, making them quite promising for the near future.
Since there is no compelling reason to keep utilizing two different syntaxes, functional components will become more visible.
We covered practically every method for using the react functional components and presented some react component examples and functions.
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FAQ's
Functional components are functions of JavaScript having logic to carry out certain operations. The React element, with no HTML content, is what these components deliver after accepting the data as props. Since React 16, developing functional components has become the de facto method of constructing components in react apps.
Every developer has to deal with the functional components while working on a React project. These components are nothing, but JavaScript functions that you can import to your Reach coding file. You can also create these functional components and define them according to your requirements. The functions may receive data as parameters depending on your instructions and definitions.
To call the functional component in react, use export statements to make a functional component available. The components can then be called the same way as other HTML elements
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