Offshore Research Partners Interview Questions and Answers

Controlled components are controlled by React, while uncontrolled components are controlled by the DOM.

• Controlled components are controlled by React state, while uncontrolled components are controlled by the DOM directly.

• Example: Input fields in a form controlled by React state vs input fields with native DOM handling.

• Lifecycle methods are methods that are automatically called at specific points in a component's life cycle.

• Example: componentDidMount() is called after the comp...read more

The full design process involves identifying requirements, brainstorming ideas, creating prototypes, testing and refining designs, and finalizing the product.

• Identify requirements and constraints

• Brainstorm ideas and concepts

• Create prototypes for testing

• Test and refine designs based on feedback

• Finalize the product design

To upload the app to both stores, create separate builds for each platform and follow the submission guidelines of each store.

• Create separate builds for iOS and Android platforms

• Follow the submission guidelines of the App Store and Google Play Store

• Submit the builds to each store separately

• Ensure that the app meets the requirements of each store

has_one is a one-to-one association while has_and_belongs_to_many is a many-to-many association in Ruby on Rails.

• has_one is used when one record is associated with another record.

• has_and_belongs_to_many is used when multiple records are associated with multiple records.

• has_one creates a foreign key in the associated record's table.

• has_and_belongs_to_many creates a join table to store the associations.

Let, Var, and Const are JavaScript keywords used for declaring variables with different scoping rules and mutability.

• Var has function scope and can be redeclared and reassigned.

• Let has block scope and can be reassigned but not redeclared.

• Const has block scope and cannot be reassigned or redeclared.

• Use const for values that won't change, let for values that will, and var for legacy code or global variables.

React Native has several life cycle methods that are called at different stages of the component's life.

• Mounting: constructor(), componentWillMount(), render(), componentDidMount()

• Updating: componentWillReceiveProps(), shouldComponentUpdate(), componentWillUpdate(), render(), componentDidUpdate()

• Unmounting: componentWillUnmount()

• Error Handling: componentDidCatch()

Local storage in React Native allows data to be stored on the device for offline use.

• AsyncStorage is the built-in API for local storage in React Native

• Data is stored as key-value pairs

• Data can be retrieved and updated asynchronously

• Local storage can be used for caching data for offline use

• Example: AsyncStorage.setItem('key', 'value')

• Example: AsyncStorage.getItem('key')