Context API in React Native - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the main purpose of React's Context API?

The Context API allows you to share data across multiple components without passing props manually at every level. It helps manage global data like themes or user info.

beginner

How do you create a new context in React Native?

Use React.createContext() to create a new context object. This object will have a Provider and a Consumer to share and access data.

beginner

What role does the Provider component play in Context API?

The Provider component wraps parts of your app and supplies the context value to all nested components that need it.

beginner

How do components consume context values in React Native?

Components can use the useContext hook with the context object to access the current context value easily.

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Why is Context API preferred over prop drilling?

Context API avoids passing props through many layers of components, making code cleaner and easier to maintain.

Which React hook is used to access context values?

A useState

B useContext

C useEffect

D useReducer

The useContext hook lets you read and subscribe to context values in functional components.

What component provides the context value to child components?

A Provider

B Consumer

C Context

D Dispatcher

The Provider component wraps children and supplies the context value.

What problem does Context API solve?

A Managing local component state

B Handling user input

C Avoiding prop drilling

D Styling components

Context API helps avoid passing props through many layers, known as prop drilling.

How do you create a new context in React Native?

A React.createContext()

B React.useContext()

C React.createProvider()

D React.useProvider()

React.createContext() creates a new context object.

Which of these is NOT part of Context API?

A Provider

B Consumer

C Context object

D Dispatcher

Dispatcher is not part of Context API; Provider, Consumer, and Context object are.

Explain how you would use Context API to share a theme color across multiple components in React Native.

Think about creating, providing, and consuming context values.

Describe the benefits of using Context API instead of passing props through many component layers.

Consider how data flows in component trees.