Science Knowings: JavaScript Course For Social Media

React Props

React Props: The Basics

What are Props?

Props (short for properties) are read-only values passed from a parent component to its child components. They allow you to customize the behavior and appearance of child components.

Example: function MyComponent(props) { return

Hello, {props.name}!

}

Prop Types: Data Types and Validation

Prop Types

Prop types define the expected data types and validation rules for props. This helps ensure type safety and avoid runtime errors.

Example: import PropTypes from 'prop-types'; function MyComponent(props) { MyComponent.propTypes = { name: PropTypes.string.isRequired, }; return

Hello, {props.name}!

}

Default Props

Default Props

Default props provide fallback values for props that are not explicitly set in the parent component. This prevents undefined values and ensures consistent behavior.

Example: function MyComponent(props) { MyComponent.defaultProps = { name: 'World', }; return

Hello, {props.name}!

}

Prop Drilling vs. Context

Prop Drilling vs. React Context

Prop drilling is the practice of passing props down through multiple levels of components to provide data to deeply nested components.

React Context is an alternative approach that allows you to globally manage state and props, avoiding prop drilling.

How to Use Props Effectively

How to Use Props Effectively

  • Keep props small and focused.
  • Use prop types for validation.
  • Set default props for optional values.
  • Avoid prop drilling when possible.
  • Consider using React Context for global state management.
  • Best Practices for Props

    Best Practices for Props

  • Use descriptive prop names.
  • Document props in component documentation.
  • Avoid changing props from within child components.
  • Use TypeScript for type checking and autocompletion.
  • Common Prop Types

    Common Prop Types

    • string
    • number
    • boolean
    • array
    • object
    • func

    Using Props in Functional and Class Components

    Functional Components

    Use the props argument in the function signature.

    Example: const MyComponent = (props) =>

    Hello, {props.name}!

    Class Components

    Declare props in the constructor.

    Example: class MyComponent extends React.Component {constructor(props) { super(props); } render() { return Hello, {this.props.name}!}}

    Next Topic: React State

    Next Topic: React State

    In the next session, we'll dive into React State, a fundamental concept for managing dynamic data within components. State allows components to track and update their internal data, driving changes in the UI. Follow us to learn more about state management in React!