Implement the scenario utility: LocalStorage wrapper items TTL. Discuss edge cases, runtime performance, and alternative paradigms.
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Example usage
const storageTTL = {
setItem(key, val, ttl) {
const payload = { val, expiry: Date.now() + ttl };
localStorage.setItem(key, JSON.stringify(payload));
},
getItem(key) {
const raw = localStorage.getItem(key);
if (!raw) return null;
const payload = JSON.parse(raw);
if (Date.now() > payload.expiry) {
localStorage.removeItem(key);
return null;
}
return payload.val;
}
};
// Example placeholder
// storageTTL.setItem('a', 1, 1000);05
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