atomic state model (Jotai, Recoil) ले धेरै साना, स्वतन्त्र एकाइहरू जसलाई atoms भनिन्छ, मध्ये ग्लोबल state बनाउँछ, bottom-up सँग तयार गरिन्छ — एक ठूलो top-down store (Redux) वा monolithic context को सट्टा। Components व्यक्तिगत atoms मा सदस्यता लिन्छन् र केवल जब ती परिवर्तन हुन्छ तब पुनः-render गर्छन्।
{ atom, useAtom } ;
countAtom = ();
nameAtom = ();
प्रत्येक atom एक आत्मनिर्भर state को टुक्रा हो। तपाइँ आवश्यकतानुसार धेरै बनाउँन सक्नुहुन्छ, प्रत्येक आफ्नै आफै सम्बोधनयोग्य।
// a derived atom computes from other atoms; recomputes when its dependencies change
const doubleAtom = atom((get) => get(countAtom) * 2);
const greetingAtom = atom((get) => `Hello, ${get(nameAtom)}`);
// writable derived atom
const upperNameAtom = atom(
(get) => get(nameAtom).toUpperCase(),
(get, set, newVal) => set(nameAtom, newVal.toLowerCase()),
);
Atoms एक dependency graph मा composition गर्छन् — derived atoms स्वचलित रूप मा अपडेट हुन्छन् जब तिनीहरूले पढेको atoms परिवर्तन हुन्छ, एक spreadsheet जस्तै।
function Counter() {
const [count, setCount] = useAtom(countAtom); // global, but useState-like API
return <button onClick={() => setCount(count + 1)}>{count}</button>;
}
function Display() {
const [double] = useAtom(doubleAtom); // re-renders ONLY when doubleAtom changes
}
Redux (top-down): one big state tree; you carve slices/selectors OUT of it
Atomic (bottom-up): start with tiny atoms; compose them UP into derived state
Granularity: each atom is independently subscribable → naturally fine-grained
re-renders (a component using countAtom ignores nameAtom changes)
✓ Fine-grained re-renders by default (subscribe to exactly the atoms you use)
✓ No selector boilerplate; derived state is just another atom
✓ Solves Context's "re-render everything" problem
✓ Great for state that's naturally decomposed into many independent pieces
✗ Many atoms can be harder to organize/trace than one centralized store
✗ Less rigid structure than Redux (a pro or con depending on the team)
Atomic model Redux को top-down संरचना को विपरित गरेर, एक विशिष्ट र बढ्दो लोकप्रिय ग्लोबल state को दृष्टिकोण हो: एक ठूलो store स्लाइस गर्नुको सट्टा, तपाइँ साना atoms लाई upward compose गर्नुहुन्छ।
यसको built-in granularity ले efficency, targeted re-renders दिन्छ selectors बिना — directly Context को performance समस्याहरु सम्बोधन गर्दै।
Atoms (र derived atoms) को समझ आपको state-management design space को ज्ञान को पूरक गर्छ, single-store (Redux/Zustand) र reactive (MobX/Signals) models को साथ, आपलाई paradigm चयन गर्न मद्दत गर्दै जो app को state shape लाई सबैभन्दा राम्रो फिट गर्छ।
विस्तृत उत्तरसहित IT अन्तर्वार्ता प्रश्नहरूको पुस्तकालय — जुनियरदेखि सिनियरसम्म।
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