Glossary term
What is sliding window? Meaning for developers
In DSA
A block of neighbouring items that moves along an array. Its state (sum, count, map) updates as one item enters and one leaves.
Learn it properly · DSALesson 22: Sliding Window: Fixed SizeReuse the last window's work instead of recomputing it.In Practical Design Problems
Count the requests in the last N seconds, at any moment. This avoids the double burst at the edge of fixed windows.
Learn it properly · Practical Design ProblemsLesson 2: Design a Rate LimiterToken bucket, leaky bucket, fixed and sliding windows, where to apply limits, 429 with Retry-After, and the new RateLimit headers.