Adding Memoize v1

src/decorators/memoize.ts

@@ -0,0 +1,19 @@
+export function Memoize(): Function {
+    return function(target: any, propertyKey: string, descriptor: PropertyDescriptor) {
+        const originalMethod = descriptor.value;
+        descriptor.value = function(this: any, ...args: any[]) {
+            const reflectKey = `${JSON.stringify(this)}_${JSON.stringify(args)}_${propertyKey}`;
+            const hasReflectData = Reflect.hasMetadata(reflectKey, target);
+
+            if (hasReflectData) {
+                return Reflect.getMetadata(reflectKey, target)
+            } else {
+                const result = originalMethod.apply(this, args);
+                Reflect.defineMetadata(reflectKey, result, target);
+                return result;
+            }
+        }
+
+        return descriptor;
+    }
+}