What are the must to understand basics of ReactJS for beginners?
Published: 2023-01-18 14:10:12

React is a library of JavaScript which is free and open source front-end development for creating user interfaces based on User interface components. Earlier, react was created by Jordan walke and now it has over thousand open source contributor. If you are a student of [JavaScript course in Delhi](https://www.admecindia.co.in/course/best-javascript-master-course/) then it is important for you to know about the basics of Reactjs. And this blog is really helpful in that.

One of the key advantages of working with this JS library is that it is capable of improving the speed of the app. In this, performance of application improves by the help of virtual DOM.

Now we’ll learn some basic concepts in react.

Props: 
Props are derived from properties and it is also an essential concept of react. And why learning props is important because it plays a vital role in transferring the data between components. And information in the component can be of any type. Without using a static value we can develop and style any component in this manner.

State:
It is possible to have reactive components that can store values using this concept. Immutability is a concept that also exist. In simple words, if we change the values manually it will show an error and the component crashing.
 

As a result, several different values we can have which is related with the component inside the same project. Because of its highly adaptable structure, it can accept almost any data.
 

setState:
As previously stated, taking the value and manually changing it is  not recommended due to immutability. So in order to come out of this problem set function helps in modifying the component. As soon as the state of an element is changed, only necessary things will change and component will re rendered.

As we know that value of state normally change, so everything should render correctly.


Life cycle:
As we know that reactjs is a collection of independent component and that’s what makes it special. There is a term called lifecycle and every react component has it. We can consider that in react lifecycle of a component is a method of series which are raised at every stages of the existence of component.

In the above article we heard the term stages let’s see what are they.

Initialization: 

This is the first stage where components are build with whatever props and default states are provided.

Mounting:

Mounting is a process in which component instance is created and inserted into DOM. As soon as the component will inserted into the Dom successfully it is called Mounted.
 
Updating:

Update is a phase where component’s state is updated and the application is recoated.

Unmounting:

Now it is the final stage of lifecycle where the component which was created earlier will get destroy.

Components:
Component is a life saviour for developers where coders use to do code everything in a single document but in react, every part of a website placed in individual component and use to get import in App.js file. These components can be reused anywhere in application. React has two types of components. One is class component and other one is function component. Where class is an older method and function is new one but learning both is important because both contain pros and cons.

Hooks:
Hooks are functions. They enable function components to pickup the features of react state as well as lifecycle. If you use hook then avoid using class component because it doesn’t work with class component. If you want to use hook then call it at the top level and use it function component.

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