All You Need to Know Before Learning Container & Presentational Components in ReactJS

Components allow us to divide the different responsibilities of applications into separate pieces and reactjs applications are composed of ‘families’ components.

Today, we are going to talk about Stateful and Stateless Components and before starting let me give a brief introduction of what is State, What is Component, What is Stateful and Stateless Components.

The key step to learning react is to understand the difference between stateful and stateless components and which ones are responsible for managing state.

State:

An object inside the constructor method of a class that must be in stateful components and used for internal communication inside a component.

The state allows creating components that are reusable and interactive. It is unstable and can only be changed by using the setState() method.

Component:

React application divided into smaller atoms and each atom represents a component. The basic building of a React enterprise application is known as components that can be either a class component or a functional component.

Generally, React components are independent and reusable that contain JavaScript XML Syntax – JSX which is a combination of JS + HTML.

Stateful and Stateless Components:

Stateful and Stateless Components also known as Smart and Dumb components, Container and Presentational components. The major difference between both of them is that one has a state and the other doesn’t.

In the Stateful components, the state gets initialized in the constructor. Stateful components keep track of data and store the information about the component’s state change memory.

The stateless component is that those who don’t have a state that means you can not use state under the components something like a normal function with no render method. Stateless components print out what is given to them using props.

So, these are the basic introduction about all now the next question that arises in mind is that what about Stateful Vs. Stateless components in React Js.

Stateful Vs. Stateless Components in React Js:

A stateful component can render both state and props but a stateless component can render props.
In stateless components the props are displayed as {props.name} whereas in stateful components, the props and state are rendered like {this.props.name} and {this.state.name} respectively.

The output of stateless components depends upon the props value and for stateful components, output depends on the value of the state.

A functional component is always a stateless component whereas class component can be stateful and stateless both.

The impressive thing to remember about stateless and stateful components is that the states of the presentational components are separated from the container components and the value of it does not affect the main state.

Now, The Thing To Focus On Is When To Make A Component Stateful or Stateless:

Simple whenever you want to have a dynamic output that means whenever the state changes the output will change – you need to make your component stateful.

On the other side if there’s no state requirement – you need to make the component stateless.

Some Useful Guidelines:

Visualize your website first, if it were one component than break it down into smaller components.
You will need to state somewhere when the information dynamically changes. Make an aim to have a parent component to keep all the information and pass to its children stateless components.

Is it feel like systematic. To have a parent component pass data down to its children and also assures that regarding state management if any debugging is required than parent component to see what’s up, instead of checking state in each child component.

Wrap UP:

The right choice for building the presentational components are stateless components as they are more elegant and usually is the right choice.

Generally, you will not find it challenging to write and understand them and they are very straightforward to test.

‘This’ keyword is not required that has always been a significant cause of confusion. Stateful components tend to combine logic and presentation in one single class and not easy to test and also can be the wrong choice for the separation issues.

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