Here is the complete guide about React state and props. You will learn what are the states and props in React and also understand the difference between states and props in React. Read the article for more information.

2. What are the Props?
Props, which stands for properties, are used to transfer data across
components. This data flows from the parent component to the child
component in a single direction. Additionally, it should be highlighted
that the data transmitted is always read-only and must not be
modified.
A unique React keyword called “Props” is used to transmit data from
component to component. However, the crucial component is the
uniform flow of data communication with props.

3. Props data are read-only, so children of elements cannot change their
parents’ data.
Consider props as objects containing the attributes and their passed-in
values from the parent component. Reusing parts is made feasible
through props.
Pass in props as an argument
Declare props variable:
function Tool(props){}
const name = props.name;

4. Example: 1
Example.js
return (
<div>
<h1>My name is {name}.</h1>
</div>
);
App.js
import Tool from "./Example"
function App() {
return (
<div className="App">
< Example name="Harry"/>
</div>
)
}
export default App

5. Output:
My name is Harry
Example 2:
function Nature() {
return In nature, nothing is perfect and everything is perfect.;
}
Output:
In nature, nothing is perfect, and everything is perfect.

6. Example 3
Output:
(Multiple Props)
function HelloWorld({ text, text2 }) {
return
<div>{text}, {text2}</div>
; }
Hello World

7. What is State:
A built-in React object called the State is used to store data or details
about the component. The State of a component can change over time;
each time it does, the component re-renders. The component’s
behaviour and rendering are determined by changes in State, which
may occur in reaction to user input or system-generated events.
Before the introduction of React Hooks, State could only be used in
class components and was not available for usage in functional parts.

8. In a structure that is continuously being updated, the State is used to
store and change data or information about a component over time. A
user action or a device event response could cause the status to
change.
The React component’s core determines the activities of the
component and how they are to be carried out.
React has an integrated state object for its components. The property
values for the item are saved in the state object. Any time the state
object is modified, the component is restored.

9. Example: 1
class Button extends React.Component {
constructor() {
super();
this.state = {
count: 0,
};
}
updateCount() {
this.setState((prevState, props) => {
return { count: prevState.count + 1 }
});
}
render() {
return (<button> this.updateCount()}
>
Clicked {this.state.count} this
</button>);
}
}

10. Example 2
class MyResume extends React.Component {
constructor(props) {
super(props);
this.state = {
Name: "Harry",
CompanyName: "Bosc",
Post: "Frontend Devloper",
Experience: "1 Year"
};
}
render() {
return (
<div>
<h1>My Resume</h1>
</div>
);
}
}

11. How do we change the State?
This should be rewritten as a functional component, in my opinion.
Use the useState() hook to accomplish this.
import React, {useState} from "react";
const MyComponent = () => {
const [value, setValue] = useState(1);
return (
<div>
<p>{value}</p>
<button onclick="{()" ==""> setValue((value + 1))}>Increment Value</button>
</div>
);
};

12. Difference between States and props
States:
• The data of the components that must be presented to the view is
stored in State.
• States can be utilised with the component to render dynamic
changes.
• The State is internal and controlled by the React Component itself.
• The data is held in State, which changes over time.
• It can’t be accessed from the outside and needs a starting value and
component.
• Although data can be accessed from outside the component, it
cannot be updated there.

13. Props:
• Data and event handlers are passed to the child components using
props.
• To communicate between components, props are needed.
• The component that renders the component controls external props.
• Props are immutable; once placed, they cannot be altered.
• Flows from the parent component may be empty.
• Read-only and non-editable data from props.

14. Conclusion
Understanding React state and props may appear complex and a little
perplexing.
A component’s State is an object that holds both private and public
local data. Additionally, it can be applied to modify a component’s
output.
Props are merely input definitions that tell you what to expect to see.
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