Full-Stack Development Development Sample 4

Question 1

Which HTTP method is considered idempotent AND safe (read-only) according to the HTTP specification?

Accepted Answer

GET

Answer

GET is both safe (does not modify state) and idempotent (repeating it has the same result), making it ideal for data retrieval.

Question 2

In a relational database, what constraint ensures that a column's value in one table matches a primary key in another table?

Accepted Answer

FOREIGN KEY constraint

Answer

A FOREIGN KEY constraint enforces referential integrity by requiring that the referenced value exists in the parent table.

Question 3

What does 'tree shaking' do in a JavaScript bundler like Webpack or Rollup?

Accepted Answer

Eliminates unused exported code from the final bundle

Answer

Tree shaking statically analyzes import/export statements and removes code paths that are never imported or called.

Question 4

Which React concept allows a component to share state logic without using inheritance?

Accepted Answer

Higher-Order Component (HOC)

Answer

A Higher-Order Component wraps another component and injects shared behavior or data as props, enabling logic reuse.

Question 5

What is a JWT (JSON Web Token) primarily used for in a full-stack application?

Accepted Answer

Transmitting claims securely between parties for authentication/authorization

Answer

JWTs encode claims in a signed, compact token so servers can verify identity without storing session state.

Full-Stack Development Practice Test