Web Development Frameworks 3

Question 1

What is the virtual DOM in React, and what problem does it solve?

Accepted Answer

An in-memory representation of the UI that minimizes expensive direct DOM manipulations

Answer

The virtual DOM is a lightweight in-memory copy of the real DOM that React uses to batch and minimize direct DOM updates for better performance.

Question 2

In Django, what is the purpose of the `migrations` directory in an app?

Accepted Answer

Contains files that track and apply changes to database schema over time

Answer

Django migration files record schema changes so they can be applied consistently across different environments and tracked in version control.

Question 3

Which Vue.js Composition API function is equivalent to the Options API's `computed` property?

Accepted Answer

computed()

Answer

The computed() function in the Composition API creates a reactive reference whose value is derived from other reactive state, just like Options API computed properties.

Question 4

What is the main architectural pattern used by Angular?

Accepted Answer

Component-based with MVC influences

Answer

Angular uses a component-based architecture with strong MVC influences, where components serve as controllers that connect templates (views) to services (models).

Question 5

In React, what is prop drilling and how is it typically solved?

Accepted Answer

Passing props through many intermediate components; solved with Context API or state management

Answer

Prop drilling occurs when data must pass through many component layers; the Context API or libraries like Redux solve this by providing global state access.

Web Development Practice Test

Web Development Practice Test

Web Development Frameworks 3