https://warriorlifepodcast.com/demo/demo-storage.js?v=b55a0a1dbeb8

1/* Demo data persists under its own namespace, separate from real station data. */
2(() => {
3  "use strict";
4  const prefix = "dcc-demo-v1:";
5  let backing;
6  try { backing = window.localStorage; } catch { /* Report failed saving below. */ }
7  const memory = new Map();
8  const storage = {
9    get length() { return this.keys().length; },
10    keys() {
11      const keys = new Set(memory.keys());
12      try { for (let i = 0; i < backing.length; i++) { const key = backing.key(i); if (key?.startsWith(prefix)) keys.add(key.slice(prefix.length)); } } catch {}
13      return [...keys];
14    },
15    key(index) { return this.keys()[index] ?? null; },
16    getItem(key) {
17      key = String(key);
18      if (memory.has(key)) return memory.get(key);
19      try { return backing.getItem(prefix + key); } catch { return null; }
20    },
21    setItem(key, value) {
22      key = String(key); value = String(value); memory.set(key, value);
23      try { backing.setItem(prefix + key, value); window.dccDemoStorageError = false; }
24      catch { window.dccDemoStorageError = true; }
25      if (key === "ft8-command-profiles-clean-v2" || key === "radio-configuration") {
26        window.dccDemoSaveLabel = window.dccDemoStorageError ? "Station not saved · storage unavailable" : "Station saved";
27        if (window.dispatchEvent) window.dispatchEvent(new CustomEvent("dcc-demo-saved"));
28      }
29    },
30    removeItem(key) { memory.delete(String(key)); try { backing.removeItem(prefix + key); } catch {} },
31    clear() { for (const key of this.keys()) this.removeItem(key); }
32  };
33  Object.defineProperty(window, "localStorage", {value: storage, configurable: false});
34  window.dccReadDemoSetting = (key, fallback) => {
35    try { return JSON.parse(storage.getItem(key)) ?? fallback; } catch { return fallback; }
36  };
37  window.dccDemoPreferences = window.dccReadDemoSetting("preferences", {});
38  window.dccDemoPreferences.temperatureUnit = window.dccDemoPreferences.temperatureUnit === "C" ? "C" : "F";
39  window.dccDemoPreferences.doubleClickTx = window.dccDemoPreferences.doubleClickTx !== false;
40})();