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State Vs Prop in React [Tabular Difference]

Published at
4/18/2024
Categories
react
reactjsdevelopment
state
prop
Author
thecodingcutie
Author
14 person written this
thecodingcutie
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State Vs Prop in React [Tabular Difference]

State vs Prop

Feature State Props
Ownership Owned and managed internally by component Defined and passed by parent component
Mutability Mutable; can be updated using setState() Immutable; cannot be changed within component
Scope Local to component Passed from parent to child components
Initialization Typically initialized within constructor for class components or using useState() hook for functional components Passed as attributes from parent component
Component-Specific Each component instance maintains its own state Passed down from parent to child components
Control Controlled and managed by the component Controlled by parent component
Communication Primarily for managing component-specific data Used for communication between parent and child components
Updates Can trigger re-renders within the component Changes in props trigger re-renders in the child component
Usage Managing internal component state Configuring child components and facilitating communication between them

Let's illustrate each point with examples:

  1. Ownership:

    • State:
     class Counter extends React.Component {
       constructor(props) {
         super(props);
         this.state = { count: 0 };
       }
       // ...
     }
    
  • Props:

     // ParentComponent.js
     import ChildComponent from './ChildComponent';
    
     function ParentComponent() {
       return <ChildComponent name="John" />;
     }
    
  1. Mutability:

    • State:
     this.setState({ count: this.state.count + 1 });
    
  • Props: Props are immutable and cannot be changed within the component.
  1. Scope:

    • State: State is local to the component and not accessible outside of it.
    • Props: Props are passed down from parent to child components and can be accessed within the child component.
  2. Initialization:

    • State:
     const [count, setCount] = useState(0);
    
  • Props:

     // ParentComponent.js
     <ChildComponent name="John" />
    
  1. Component-Specific:

    • State: Each instance of a component maintains its own state.
    • Props: Props are passed from parent components and can be different for each instance of the child component.
  2. Control:

    • State: Controlled and managed by the component itself.
    • Props: Controlled by the parent component, and changes are propagated down to child components.
  3. Communication:

    • State: Used for managing component-specific data that can change over time.
    • Props: Used for passing data and behavior from parent to child components.
  4. Updates:

    • State: Changes to state trigger re-renders within the component.
    • Props: Changes in props trigger re-renders in the child component.
  5. Usage:

    • State: Used for managing internal component state, such as form inputs, toggle states, etc.
    • Props: Used for configuring child components and facilitating communication between them.
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