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Lessons (10)

• Hash Maps & Sets

  … A hash map is that catalogue. A hash function turns a key (like "apple" ) into a number (a …

• DSA Interview Patterns Cheat Sheet

  … 4. Optimise: "The bottleneck is the inner search… a hash map makes that O(1)." Name the pattern …

• Topics, Partitions & Offsets

  … order-42"] -- "hash → 1" P1[Partition 1] K2["key: order-77"] -- "hash → 0" P0[Partition 0] K3["key …

• Big-O Notation Made Simple

  … O(1) Constant 1 Array index arr[5] , hash map lookup O(log n) Logarithmic ~10 Binary search …

• Replication, Partitioning & Sharding

  … tenant id is often safer than an arbitrary hash when tenancy is a hard isolation boundary. Avoid hot …

• Two Pointers & Sliding Window

  … br/ of seen values?"} C -- Yes HM["🗂️ Hash map"] C -- No D["Consider sorting first,<br/ then …

• Frontend Performance & Core Web Vitals

  … false, loading: () = <MapSkeleton / }); Next.js already splits every route automatically. Check what's in your bundles with @next …

• Linked Lists

  … on repeat (circular), LRU caches (doubly linked list + hash map), undo stacks, OS task scheduling. Technique 1: Traverse …

• SQL vs NoSQL Databases

  … profiles, CMS content MongoDB Key-value A giant hash map Caching, sessions, counters Redis, DynamoDB Wide-column Rows …

• REST API Design

  … 42 GET /users/42/orders The standard CRUD map Action Method + path Success status --- --- --- List GET /articles 200 …