Full-Stack Development An Intro to Full-Stack Development 3

Question 1

Which of the following is a JavaScript runtime that allows developers to run JS code on the server side?

Accepted Answer

Node.js

Answer

Node.js is a JavaScript runtime built on Chrome's V8 engine that enables server-side JavaScript execution.

Question 2

What does CORS stand for and why does it matter in full-stack development?

Accepted Answer

Cross-Origin Resource Sharing — controls which domains can access your API

Answer

CORS (Cross-Origin Resource Sharing) is a browser security feature that restricts cross-domain HTTP requests unless the server explicitly allows them.

Question 3

In a React single-page application, what happens when the user navigates to a new route?

Accepted Answer

JavaScript intercepts the navigation and renders a new component without a full page reload

Answer

React Router (or similar) intercepts navigation events and renders new components client-side, keeping the page loaded.

Question 4

What is the primary advantage of using environment variables in a full-stack application?

Accepted Answer

They allow sensitive configuration values to be kept out of source code

Answer

Environment variables store secrets like API keys and DB passwords separately from code, preventing them from being committed to version control.

Question 5

Which SQL clause is used to filter rows returned by a query?

Accepted Answer

WHERE

Answer

The WHERE clause filters individual rows before any grouping or aggregation occurs.

Full-Stack Development Practice Test

Full-Stack Development Practice Test

Full-Stack Development An Intro to Full-Stack Development 3