Question Library

What problem do compound components solve?

Closures capture variables by reference, not by value.

Write a query to return the second-highest salary from an Employees table.

Which property creates a new stacking context on its own?

How would you shard a multi-tenant database as customer count grows past 10M rows?

Implement a debounce function with a configurable delay.

useEffect with an empty dependency array runs after every re-render.

Which header mitigates clickjacking attacks?

Which join type returns all rows from both tables, matched where possible?

TCP establishes a connection using a _____-way handshake.

Write a Flexbox layout that centers a card both vertically and horizontally.