Merge pull request #1 from adamjosefus/development

Create `Cache` class.

Author: adamjosefus

Diff for: .gitignore

@@ -0,0 +1,2 @@
+.DS_Store
+!.vscode/settings.json

Diff for: .vscode/settings.json

@@ -0,0 +1,5 @@
+{
+    "deno.enable": true,
+    "deno.lint": true,
+    "deno.unstable": false
+}

Diff for: Cache/Cache.ts

@@ -0,0 +1,48 @@
+/**
+ * @copyright Copyright (c) 2022 Adam Josefus
+ */
+
+type GeneratorType<T> = () => T;
+
+type LoadOnlyEntryType<T> = [key: string];
+type LoadAndGenerateEntryType<T> = [key: string, generator: GeneratorType<T>];
+type LoadEntryType<T> = LoadOnlyEntryType<T> | LoadAndGenerateEntryType<T>;
+
+
+export class Cache<T> {
+
+    readonly #storage: Map<string, T> = new Map();
+
+    load<E extends LoadEntryType<T>>(...args: E): E extends LoadAndGenerateEntryType<T> ? T : T | undefined {
+        const [key, generator] = args;
+
+        if (this.#storage.has(key)) {
+            return this.#storage.get(key)!;
+        }
+
+        if (generator) {
+            const value = generator();
+            this.save(key, value);
+
+            return value;
+        }
+
+        // deno-lint-ignore no-explicit-any
+        return undefined as any;
+    }
+
+
+    save(key: string, value: T): void {
+        this.#storage.set(key, value);
+    }
+
+
+    has(key: string): boolean {
+        return this.#storage.has(key);
+    }
+
+
+    delete(key: string): void {
+        this.#storage.delete(key);
+    }
+}

Diff for: mod.ts

@@ -0,0 +1 @@
+export { Cache } from './Cache/Cache.ts';