Explore 148 perguntas com resposta em inglês, 17 exercícios práticos e uma rotina de estudo. No app, os conceitos têm flashcards. Os exercícios têm tarefas e critérios de verificação, e quizzes e simulados usam um banco próprio de 197 questões.
JavaScript · 14 tópicos
What is a Closure?2 minWhat is the difference between const, let and var?2 minWhat are the types of Functions in JavaScript?2 minWhat is
this?2 minWhat is bind, call, apply?2 minWhat is Hoisting?2 minWhat are Classes?2 minWhat is a Prototype?2 minTruthy and Falsy?2 minDifferences between Promises and callbacks? Why do we prefer Promises?2 minWhat are the differences between Promise combinators?2 minWhat happens when you await a non-Promise value?2 minHow do you handle errors in async/await code?2 minPractice lab: Predict before running asynchronous code2 minTypeScript · 10 tópicos
What is TypeScript?2 minWhy is TypeScript good?2 minPartial, Required, Pick, Omit, Record — when would you use each?2 minDifference between interface and type?2 minCan you explain generics?2 minDifference between unknown and any?2 minWhat is a type guard?2 minWhat is a discriminated union?2 minWhat is
never?2 minPractice lab: Validate a boundary and model its states2 minNode.js · 12 tópicos
What is Node.js?2 minThe Event Loop2 minWhy is Node.js non-blocking?2 minWhat is the difference between process.nextTick(), setImmediate(), and setTimeout(fn, 0)?2 minWhat are Node.js streams?2 minWhat is backpressure?2 minHow would you detect and fix a memory leak in production?2 minWhen does the Garbage Collector run?2 minHow do you handle errors globally in Node?2 minNode.js is single-threaded — how do you use multiple cores?2 minCommonJS vs ES Modules?2 minPractice lab: Bound work when the consumer is slow2 min
NestJS · 7 tópicos
What is NestJS?2 minWhy is NestJS good?2 minWhat is a Module, Controller, Provider, Service?2 minDifference between Middleware, Guard, Interceptor, Pipe, and Exception Filter?2 minHow does Dependency Injection work and why does it matter?2 minWhat is a DTO?2 minPractice lab: Trace the rejected request2 min
React · 12 tópicos
What is React?2 minWhat is the Virtual DOM?2 minComponent vs Element?2 minProps and State?2 minHow can a child talk to its parent?2 minWhat is a Hook?2 minWhy do list items need a key?2 minuseEffect traps (cleanup + dependency array)2 minWhat is the Context API?2 minWhat is React Router?2 minRedux vs Context?2 minPractice lab: Prevent a stale search result2 min
Testing · 4 tópicos
SQL / PostgreSQL · 8 tópicos
REST / HTTP · 8 tópicos
GraphQL · 6 tópicos
Real-Time · 4 tópicos
SOLID & Design Patterns · 9 tópicos
AI / LLM Engineering · 24 tópicos
What is a token? What is a context window?2 minWhat is RAG?2 minRAG vs Fine-tuning vs Prompt Engineering?2 minHow do you choose a model?2 minThe RAG pipeline (memorize this flow)2 minWhat is chunking?2 minWhat are embeddings?2 minWhat is a vector database?2 minWhat is hybrid search and re-ranking?2 minWhat are LLM evals?2 minWhat causes hallucination? How do you reduce it?2 minWhat are guardrails?2 minWhat is LLM observability?2 minHow do you optimize LLM cost and latency?2 minWhat is structured output?2 minTemperature?2 minWhat is tool/function calling?2 minWhat is an AI agent?2 minAgent design essentials2 minWhat is MCP?2 minWhat is conversation memory?2 minMultimodal basics (voice and images)2 minWhat is Thompson Sampling?2 minPractice lab: Locate the failure before changing the model2 min
System Design · 18 tópicos
A framework for the design conversation2 minLatency vs throughput?2 minWhat is RPS? (the back-of-envelope math)2 minWhat are p50 / p95 / p99?2 minNumbers to have in your head2 minLoad balancer vs API gateway?2 minHow do you scale reads?2 minHow do you scale writes?2 minSQL vs NoSQL in a design round?2 minCAP theorem?2 minQueue vs Pub/Sub?2 minRate limiting?2 minMicroservices vs monolith?2 minObservability?2 minResilience patterns (drop these terms naturally)2 minClassic problems to practice out loud2 minAI system design examples2 minPractice lab: Size a notification backlog2 min