Question 1

What is the main difference between a controlled and an uncontrolled input in React Native?

Accepted Answer

A controlled input is managed by React state via value and onChangeText props, allowing full control over the value at any time. An uncontrolled input uses a ref to directly access the DOM value without going through React state. Controlled inputs are recommended as they facilitate real-time validation and synchronization with the application state.

Question 2

Which React Hook Form hook is used to register an input and handle its validation?

Accepted Answer

The useForm hook from React Hook Form returns an object containing several methods and properties. The register method allows registering an input in the form and attaching validation rules to it. It returns the necessary props (onChange, onBlur, ref) to connect the input to the form management system.

Question 3

How to define an email validation schema with Yup?

Accepted Answer

Yup uses a chainable API to define validation schemas. To validate an email, use yup.string() to define the type, then chain .email() for email format validation, and optionally .required() to make the field mandatory. This declarative approach allows creating readable and reusable validations.

Forms & Validation

What is the main difference between a controlled and an uncontrolled input in React Native?

Câu trả lời

Which React Hook Form hook is used to register an input and handle its validation?

Câu trả lời

How to define an email validation schema with Yup?

Câu trả lời

In Formik, which prop is used to define the initial values of the form?

What is the main performance advantage of React Hook Form compared to Formik?

Các chủ đề phỏng vấn React Native khác

JavaScript Essentials

React Fundamentals

React Native Basics

React Hooks

TypeScript for React & React Native

React Native Components & API

React Native Styling & Layout

React Native Navigation

React Native State Management

React Native Networking & API

Data Persistence

React Native Animations

Native Modules & Bridge

Platform-Specific Code

Permissions & Device APIs

Push Notifications

React Native Testing

React Native Debugging

Build & Deployment

Expo vs React Native Bare

Performance Optimization

Memory Management

Architecture Patterns

React Native New Architecture

Security Best Practices

Offline-First Architecture

React Native CI/CD

Monorepo & Code Sharing

Advanced Topics

App Lifecycle & Background Execution

Authentication & Session Management

Monitoring & Crash Reporting

Nắm vững React Native cho lần phỏng vấn tiếp theo