The components refer to the core unit and the components of React. To help you comprehend, as everything on earth is composed of particles The components are the elements of ReactJS. The website or application being created using ReactJS will consist from the various components that are referred to as the components.
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Types of ReactJs Components in Programming
1. Functional Component
Functional component can be made just by writing Javascript functions. In particular, functional components are the ones that read the Props into and return JSX. Functional components could or not be able to accept the data in the form parameters. Furthermore the functional components do not include lifecycle methods or state, however they could be added using React Hooks. Functional components are simple to read, debug and test.
2. Class Component
The class component happens to be the largest frequently used component in all the different kinds. It is due to the fact that it can perform each function that the component performs, and in addition, it has additional capabilities too. It has the ability to make efficient use of the primary capabilities that React provides, including props lifecycle and state methods and. However, the components for class are more complicated compared to functional components. The data can be transferred across from one class component the next class component with ease.
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3. Pure Component
Pure component are among the most basic and efficient components one can write. Since pure components aren't modified their behavior or interdependence with the status of other variables outside their own scope they are able to replace the basic functional components. The components that only provide rendering functions are the most suitable as pure components. The main use of Pure components Pure component is to offer improvements.
4. Higher-Order Components
Higher-order components also referred to as HOC aren't as similar to a React component, but more of patterns, which is due to React's Compositional nature. The primary use of HOC is sharing the logic with other components.
React Component Lifecycle
The React web apps are an amalgamation of various components, which are distinct and operate based on the interactions that they make. Each component is part of its own life cycle. Life Cycle refers to the succession of techniques that re-invoke the various phases that the components' existence.
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The React component in general includes the following three phases:
1. Mounting
After the initialization of components is completed and the component is placed on DOM and then rendered on the website. React follows the default procedure in the Naming Conventions of the functions that are predefined. Functions that include "Will" are a representation of before a particular phase. The function with "Did" means the time after the completion in the particular phase. The stage of mounting of components is comprised of two parts:
- componentWillMount() Function This function is called before mounting the component on the DOM.
- componentDidMount() Function: in contrast to the one before the function is invoked when the component is installed on the document.
2. Update
The process of updating is that occurs when the states and properties of a component are changed in response to a request or event of the user, such as pressing the key, pressing on the mouse, or pressing the key, etc. It allows active websites to act in accordance with the requirements and preferences of their users.
3. Unmounting
It's the end of the line of the lifecycle for components. This is the time when components are removed and removed from DOM. The following function is the sole part of this function
componentWillUnmount() Function: the function is invoked just before the component is completely unmounted from DOM. It happens just prior to the removal of the component from the page, and this is the time to donate the lifecycle.
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