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Questions and Answers
What is a React component?
Props are mutable values passed from a parent component to a child component.
False
What is the purpose of the state object in a React component?
To store data that can change within a component
In React, event handlers are functions that are called when an _______ occurs.
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What is the purpose of the useState hook in React?
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Synthetic events in React provide a inconsistent interface across different browsers.
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Match the following concepts with their descriptions:
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What is the difference between functional components and class components in React?
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Study Notes
Components
- Building blocks of a React application
- Reusable pieces of code that represent a part of the UI
- Can be either functional or class components
- Functional components: pure functions that take in props and return JSX
- Class components: classes that extend the
React.Componentclass
Props
- Short for "properties"
- Immutable values passed from a parent component to a child component
- Used to customize the behavior of a component
- Can be any type of data (string, number, object, etc.)
- Passed as an object to the component, with each key-value pair being a prop
- Example: ``
State
- An object that stores data that can change within a component
- Used to store data that is specific to a component and can change over time
- Initialized in the component's constructor or with a state hook (
useState) - Can be updated using the
setStatemethod or theuseStatehook - When state changes, the component is re-rendered with the new state
Event Handling
- A way to respond to user interactions (e.g. clicks, hover, keyboard input)
- In React, event handling is done using event handlers
- Event handlers are functions that are called when an event occurs
- Event handlers are passed as props to components
- Example:
console.log("Button clicked!")}>Click me! - Synthetic events: React's way of handling events, which provides a consistent interface across different browsers
React Components
- Building blocks of a React application, reusable pieces of code that represent a part of the UI
- Can be either functional or class components
- Functional components: pure functions that take in props and return JSX
- Class components: classes that extend the
React.Componentclass
Props
- Short for "properties", immutable values passed from a parent component to a child component
- Used to customize the behavior of a component
- Can be any type of data (string, number, object, etc.)
- Passed as an object to the component, with each key-value pair being a prop
State
- An object that stores data that can change within a component
- Used to store data that is specific to a component and can change over time
- Initialized in the component's constructor or with a state hook (
useState) - Can be updated using the
setStatemethod or theuseStatehook - When state changes, the component is re-rendered with the new state
Event Handling
- A way to respond to user interactions (e.g. clicks, hover, keyboard input)
- In React, event handling is done using event handlers
- Event handlers are functions that are called when an event occurs
- Event handlers are passed as props to components
- Synthetic events: React's way of handling events, which provides a consistent interface across different browsers
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Description
Understand the building blocks of a React application, including reusable code components and props, which are immutable values passed from a parent to a child component.
