Web Storage (localStorage, sessionStorage, cookies)

Which advanced storage pattern is implemented in this code?

class Storage {
  constructor(type = 'localStorage') {
    this.storage = window[type];
  }

  set(key, value, ttl = null) {
    const item = {
      value,
      timestamp: ttl ? Date.now() + ttl : null
    };
    this.storage.setItem(key, JSON.stringify(item));
  }

  get(key) {
    const item = JSON.parse(this.storage.getItem(key));
    if (!item) return null;
    if (item.timestamp && Date.now() > item.timestamp) {
      this.storage.removeItem(key);
      return null;
    }
    return item.value;
  }
}

Basic key-value storage
Compression of stored data
Time-to-live (TTL) functionality for stored items
This code implements a Time-to-live (TTL) pattern for Web Storage: 1) It wraps storage operations with automatic expiration functionality, 2) Each stored item includes a timestamp for expiration checking, 3) The get method automatically removes expired items, 4) It supports both permanent and temporary storage through optional TTL parameter, 5) The implementation works with both localStorage and sessionStorage, 6) It maintains a consistent interface while adding advanced functionality, 7) The pattern is useful for implementing cache-like behavior, 8) It helps manage storage cleanup automatically based on time restrictions.
Encryption of stored data

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