Passing parameters between screens in React Native - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of passing parameters between screens in React Native?

Passing parameters allows screens to share data, like sending a user's name from a list screen to a detail screen, making the app interactive and dynamic.

beginner

How do you pass parameters when navigating to another screen using React Navigation?

You pass parameters by adding an object as the second argument to the navigation function, for example: navigation.navigate('ScreenName', { paramName: value }).

beginner

How can a screen access the parameters passed to it in React Native with React Navigation?

The screen can access parameters via the route object: route.params.paramName, where route is a prop automatically provided to the screen component.

intermediate

What happens if you try to access a parameter that was not passed to a screen?

Accessing a parameter that was not passed returns undefined, so it is good to provide default values or check if the parameter exists to avoid errors.

beginner

Why is passing parameters between screens important in mobile app development?

It enables screens to communicate and share data, creating a smooth user experience, like showing details of a selected item or passing user input to another screen.

How do you pass a parameter named 'id' with value 5 when navigating to 'Details' screen?

A navigation.goTo('Details', id=5)

B navigation.move('Details', { id: 5 })

C navigation.push('Details', id=5)

D navigation.navigate('Details', { id: 5 })

The correct syntax to pass parameters is navigation.navigate('ScreenName', { paramName: value }).

Where do you find the passed parameters inside the target screen?

A route.params

B props.navigation.params

C navigation.route.params

D props.route.navigation

React Navigation provides the route prop to the screen, and parameters are inside route.params.

What will happen if you try to access a parameter that was not passed?

A It returns undefined

B It returns null

C It throws an error and crashes the app

D It returns an empty string

Accessing a missing parameter returns undefined, so you should handle this case.

Which React Navigation function is commonly used to move to another screen with parameters?

A pop

B goBack

C navigate

D reset

The navigate function is used to go to another screen and can include parameters.

Why should you check if a parameter exists before using it?

A To reduce app size

B To avoid app crashes or unexpected behavior

C To improve app speed

D To change screen colors

Checking parameters prevents errors if the parameter was not passed.

Explain how to pass and access parameters between two screens in React Native using React Navigation.

Think about how you send data when moving from one screen to another and how the receiving screen reads it.

Describe why passing parameters between screens is useful in a mobile app.

Consider how apps show details or personalized info based on user actions.