add: proxy samples

Author: thutasann

standalone-apis/node-kafka-conduktor/README.md

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+# Nodejs Kafka Event-driven Microsevices

standalone-apis/pure-nodejs-concepts/concepts/proxy/data-binding.js

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+function createReactiveObject(target, onChange) {
+	return new Proxy(target, {
+		set(target, prop, value) {
+			const result = Reflect.set(target, prop, value);
+			onChange(prop, value);
+			return result;
+		},
+	});
+}
+
+const state = createReactiveObject({ count: 0 }, (prop, value) => {
+	console.log(`Property ${prop} changed to ${value}`);
+});
+
+state.count = 1;
+state.count = 2;

standalone-apis/pure-nodejs-concepts/concepts/proxy/log-debug.js

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+const logHandler = {
+	get(target, prop, receiver) {
+		console.log(`Getting ${prop}`);
+		return Reflect.get(...arguments);
+	},
+	set(target, prop, value) {
+		console.log(`Setting ${prop} to ${value}`);
+		return Reflect.set(...arguments);
+	},
+};
+
+const loggedObject = new Proxy({}, logHandler);
+
+loggedObject.a = 1;
+console.log(loggedObject.a);

standalone-apis/pure-nodejs-concepts/concepts/proxy/make-objects-for-testing.js

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+const apiMock = new Proxy(
+	{},
+	{
+		get(target, prop) {
+			if (prop === 'fetchData') {
+				return () => Promise.resolve({ data: 'mocked data' });
+			}
+			return () => Promise.reject(new Error('not implemented'));
+		},
+	},
+);
+apiMock.fetchData().then((response) => console.log(response.data));