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Lessons (10)

• Stacks & Queues

  … Avoid shift() on large arrays; use a proper queue. - Stacks: undo, call stack, bracket matching, DFS, monotonic-stack …

• JavaScript Essentials: Event Loop, Closures & this

  … call stack, Web APIs, task queues](/img/frontend/event-loop.svg) Part Kitchen analogy Role --- --- --- Call stack The …

• Recursion & Backtracking

  … Trust the smaller call. - Each call is a frame on the call stack; very deep recursion can overflow …

• Graphs: BFS & DFS

  … DFS uses a stack , usually the call stack via recursion. js function dfs(graph, node, visited = new Set …

• Big-O Notation Made Simple

  … each pending call sits on the call stack . A recursion 10,000 levels deep uses O(10,000 …

• Clean Error Handling

  … logged, then forgotten; the caller thinks it worked try { await saveOrder(order); } catch (e) { console.log(e); } js …

• Backend Languages: Node.js, Go, Python & Rust

  … one thread + event loop"] EL(("🔁 event loop")) -- IO1[DB call → wait in background] EL -- IO2[HTTP call → wait …

• Monolith vs Microservices

  … The network is homogeneous. mermaid flowchart LR subgraph InProcess["Monolith"] A1[orders.create] -- "function call<br/ ~0.001 …

• Structural Patterns: How to Connect Objects

  … e; } } }; // Stack them like toppings const getUser = withLogging(withCache(withRetry(fetchUser)), "getUser"); mermaid flowchart LR Call[getUser 42 …

• Dynamic Programming

  … the recursive idea) Needs the right fill order Stack overflow risk Yes, on deep inputs No Can save …