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Lessons (9)

• Linked Lists

  … Reverse a linked list ⭐ The 1 linked-list interview question. Use three pointers: prev , current , next . js function …

• DSA Interview Patterns Cheat Sheet

  … linked list cycle", "middle of list" Fast & slow pointers O(n), O(1) space "reverse linked list" prev …

• Microkernel (Plugin) Architecture

  … MarkdownPlugin = { name: "emoji", version: "1.0.0", beforeParse: (md) = md.replaceAll(":rocket:", "🚀").replaceAll(":tada:", "🎉"), }; // plugins/external-links.ts …

• Frontend Performance & Core Web Vitals

  … swap . html <link rel="preload" href="/fonts/inter.woff2" as="font" type="font/woff2" crossorigin / <link rel="preconnect …

• Trees & Binary Search Trees

  … 5)) & b7((7)) end subgraph Degenerate["Degenerate (a linked list!)"] d1((1)) -- d2((2)) -- d3((3)) -- d4((4 …

• Graphs: BFS & DFS

  … adjacency list The most common representation: a map from each node to the list of its neighbours. js …

• Frontend Testing Strategy

  … 201 })), ]; tsx it("lists products from the API", async () = { render(<ProductsPage / ); expect(await screen.findByText("Keyboard")).toBeInTheDocument(); // findBy …

• Two Pointers & Sliding Window

  … left, one moves faster Remove duplicates, move zeroes, linked-list cycle Two arrays One pointer per array Merge …

• Behavioral Patterns II: Chain, Template, Iterator, Mediator, Memento, Visitor

  … stop the chain with 401 app.get("/orders", listOrders); function authenticate(req, res, next) { const user = verifyToken(req …