Uv Techsoft Interview Questions and Answers

Hooks in ReactJS are functions that let you use state and other React features without writing a class.

• Hooks were introduced in React 16.8 to allow functional components to have state and lifecycle methods.

• useState() is a hook that allows you to add state to functional components.

• useEffect() is a hook that lets you perform side effects in functional components.

• Custom hooks are reusable functions that contain logic and can be shared across multiple components.

Cookies are small pieces of data stored on the client's browser to track user activity and preferences on a website.

• Cookies are set by the server and sent to the client's browser in the HTTP response headers.

• The browser stores the cookies and sends them back to the server with each subsequent request.

• Cookies can store information such as user preferences, shopping cart items, and session identifiers.

• Cookies have an expiration date and can be either session cookies (deleted wh...read more

Authentication process involves verifying the identity of a user before granting access to a system.

• User provides credentials (e.g. username and password) to the system.

• System validates the credentials against stored data (e.g. database).

• If credentials match, user is granted access.

• Additional security measures like two-factor authentication may be used.

Trigger is a piece of code that executes before or after specific data manipulation events, while async apex is code that runs in the background asynchronously.

• Triggers are used to perform custom actions before or after data manipulation events like insert, update, delete, etc.

• Async apex is used to run processes in the background asynchronously, without blocking the user interface.

• Triggers are written in Apex and are associated with specific objects in Salesforce.

• Async apex i...read more

Batch Apex is a Salesforce feature that allows for processing large amounts of data in batches to prevent hitting governor limits.

• Batch Apex is used to handle large data volumes by breaking the processing into smaller chunks called batches.

• It is useful for operations like updating records, sending emails, or making callouts in Salesforce.

• Batch Apex jobs can be scheduled to run at specific times or can be run manually.

• It helps in avoiding governor limits like the maximum numbe...read more