RAG Vector Search
Cosine similarity + FAISS-style top-k in pure NumPy - the core of modern AI apps.
def top_k_similar(query_emb, corpus_embs, k=5):scores = np.dot(corpus_embs, query_emb) / (np.linalg.norm(corpus_embs, axis=1) * np.linalg.norm(query_emb))return np.argsort(scores)[-k:][::-1]
60 LOC Reactive Store
Zustand-style store with signals, derived state & persistence - zero dependencies.
function createStore(init) {let state = init;const subs = new Set();return {get: () => state,set: (fn) => { state = fn(state); subs.forEach(s => s(state)); },subscribe: (fn) => { subs.add(fn); return () => subs.delete(fn); }};}
useDeferredValue + Transition
React 18+ concurrent rendering patterns for instant search UX.
const deferredQuery = useDeferredValue(query);const isStale = deferredQuery !== query;
React 19 useActionState
Server Actions + optimistic UI in 12 lines - the future of forms.
const [state, submit, isPending] = useActionState(async (prev, form) => { /* server action */ },{ error: null });
Lock-Free Ring Buffer
Zero-allocation, cache-friendly SPSC ring buffer in Rust using atomics.
struct RingBuf<T, const N: usize> {buf: [MaybeUninit<T>; N],head: AtomicUsize,tail: AtomicUsize,}impl<T, const N: usize> RingBuf<T, N> {fn push(&self, val: T) -> bool { /* ... */ true }}
Tailwind + CSS Variables Theme Engine
Dark/light/system + custom brand colors with zero runtime JS.
:root { --primary: 234 179 8; }.dark { --primary: 250 204 21; }.bg-primary { background-color: hsl(var(--primary)); }
Scroll-Driven Animations
Pure CSS scroll progress animations - no JavaScript, buttery 60fps.
@keyframes reveal {from { opacity: 0; translate: 0 60px; }to { opacity: 1; translate: 0 0; }}.card { animation: reveal linear both; animation-timeline: view(); animation-range: entry 0% entry 50%; }
Rate Limiter with Redis
Token bucket + sliding window in 18 lines - production ready.
async def is_allowed(user_id: str, redis):key = f#86efac">"rate:{user_id}"await redis.incr(key)await redis.expire(key, 60)
Debounce with Cleanup
TypeScript-safe debounce with proper cleanup - battle-tested for search, resize & real-time inputs.
function useDebounce<T>(value: T, delay: number): T {const [debounced, setDebounced] = useState(value);useEffect(() => {const timer = setTimeout(() => setDebounced(value), delay);return () => clearTimeout(timer);}, [value, delay]);return debounced;}
Trie Autocomplete
O(m) prefix search regardless of dictionary size - used in IDEs & search engines.
class Trie:def __init__(self):self.root = {}def insert(self, word: str):node = self.rootfor ch in word:node = node.setdefault(ch, {})node[#86efac">'$'] = True
Binary Search Tree Iterator
O(1) amortized next() using explicit stack - LeetCode 173.
class BSTIterator:def __init__(self, root):self.stack = []self._leftmost_inorder(root)
Async Generator Pipeline
Memory-efficient lazy pagination using async generators - never load the entire dataset again.
async def paginate(url: str):while url:resp = await httpx.get(url)data = resp.json()yield data[#86efac">"results"]url = data.get(#86efac">"next")async for batch in paginate(#86efac">"/api/items?limit=500"):process(batch)
WebAssembly Memory Pool
Zero-copy Rust → JS memory sharing using linear memory pools.
#[wasm_bindgen]pub struct MemoryPool {buffer: Vec<u8>,}
Zero-Downtime K8s Deploy
RollingUpdate + preStop hook + graceful shutdown - zero dropped requests.
strategy:type: RollingUpdaterollingUpdate:maxSurge: 2maxUnavailable: 0lifecycle:preStop:exec:command: [#86efac">"sleep", "30"]
Kubernetes HPA + VPA Combo
Horizontal + Vertical Pod Autoscaler for true cost-optimized scaling.
apiVersion: autoscaling.k8s.io/v1kind: VerticalPodAutoscalerspec:updatePolicy:updateMode: #86efac">"Auto"
CSS Logical Properties
Direction-agnostic layouts that instantly support RTL & 120+ languages.
.card {margin-inline: auto;padding-block: 1.5rem;padding-inline: 2rem;border-inline-start: 4px solid indigo;inset-inline-end: 0;}