Interview Questions

Open-source, community-reviewed questions for developers

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Beginner5m

Primary Key vs Unique Key

Database Fundamentals
SQL
Easy5m

DELETE vs TRUNCATE

Database Fundamentals
SQL
Easy10m

interface vs type

Type Systems
TypeScript
Medium10m

async/await

Async Programming
.NETJavaScript
Medium10m

Clustered Index

Database Fundamentals
SQL
Medium15m

Dependency Injection

Design Patterns
.NET
Medium20m

IDisposable & Disposal Pattern

Design Patterns
.NET
Medium12m

Closures

Type Systems
JavaScript
Medium15m

React State Management

React Fundamentals
React
Medium15m

Discriminated Unions

Type Systems
TypeScript
Medium15m

Virtual DOM & Reconciliation

React Fundamentals
React
Hard15m

Optimistic vs Pessimistic Locking

Distributed Systems
System Design
Hard20m

Sharding vs Partitioning

Database Fundamentals
System Design
Hard20m

Task.WhenAll vs Parallel.ForEach

Design Patterns
.NET
Hard20m

Prototype Chain & new

Type Systems
JavaScript
Hard20m

B-Tree Indexes & SARGability

Database Fundamentals
SQL
Hard15m

useEffect vs useLayoutEffect

React Fundamentals
React
Expert15m

The infer Keyword

Type Systems
TypeScript