Add ObjectStorage object implementing Storage API

readme.md

@@ -37,3 +37,9 @@ recommendable.
 
 Turns template literals directly into HTML templates. Just read the code, it's
 like 5 lines or so.
+
+## Storage
+
+Currently a sngle class `ObjectStorage` implementing the API of the Storage
+class using a plain JS Map as backend. This is mostly meant as a page-local
+fallback to LocalStorage and SessionStorage

storage.js

@@ -0,0 +1,21 @@
+export class ObjectStorage {
+	#map = new Map()
+	key(index) {
+		return [...this.#map.keys()][index]
+	}
+	getItem(keyName) {
+		if (this.#map.has(keyName))
+			return this.#map.get(keyName)
+		else
+			return null
+	}
+	setItem(keyName, keyValue) {
+		this.#map.set(keyName, keyValue)
+	}
+	removeItem(keyName) {
+		this.#map.delete(keyName)
+	}
+	clear() {
+		this.#map.clear()
+	}
+}