Redis

Example Prompts

• "Add Redis caching with proper invalidation strategy"
• "Build a distributed rate limiter using sliding window"
• "Implement a real-time leaderboard with sorted sets"

Example Output

async function rateLimit(userId: string, limit: number, windowSec: number) {
  const key = `rate:${userId}`;
  const now = Date.now();
  const pipeline = redis.pipeline();
  pipeline.zremrangebyscore(key, 0, now - windowSec * 1000);
  pipeline.zadd(key, now, `${now}-${crypto.randomUUID()}`);
  pipeline.zcard(key);
  pipeline.expire(key, windowSec);
  const results = await pipeline.exec();
  return (results[2][1] as number) <= limit;
}