Learned about Modules, import and export, default and named import/ex…

…port

03 - Chai aur Javascript/17 - Modules/circular_dependencies_a.js

@@ -0,0 +1,7 @@
+import { bFunction } from "./circular_dependencies_b";
+export function aFunction() {
+  console.log("aFunction");
+  bFunction();
+}
+
+aFunction();

03 - Chai aur Javascript/17 - Modules/circular_dependencies_b.js

@@ -0,0 +1,5 @@
+import { aFunction } from "./circular_dependencies_a";
+export function bFunction() {
+  console.log("bFunction");
+  aFunction();
+}

03 - Chai aur Javascript/17 - Modules/counter.js

@@ -0,0 +1,7 @@
+let count = 0;
+
+console.log("Module loaded");
+export function increment() {
+  count++;
+  return count;
+}

03 - Chai aur Javascript/17 - Modules/greet.js

@@ -0,0 +1,3 @@
+export default function greet(name) {
+  return `Hello ${name}`;
+}

03 - Chai aur Javascript/17 - Modules/math.js

@@ -0,0 +1,19 @@
+// Export variable
+export const pi = 3.14159;
+
+// Export Function
+export function add(a, b) {
+  return a + b;
+}
+
+// Export Class
+export class Calculator {
+  multiply(x, y) {
+    return x * y;
+  }
+}
+
+// Re-exporting
+export function subtract(a, b) {
+  return a - b;
+}

03 - Chai aur Javascript/17 - Modules/mathUtil.js

@@ -0,0 +1,6 @@
+import { add, subtract } from "./mathOperations.js";
+
+export default {
+  add,
+  subtract,
+};

03 - Chai aur Javascript/17 - Modules/script.js

@@ -0,0 +1,39 @@
+// Importing modules
+
+import { pi, add, Calculator } from "./math.js";
+
+console.log("Pi: ", pi); // Pi: 3.14159
+
+console.log("Addition is ", add(2, 4)); // Addition is 6
+
+const cal = new Calculator();
+console.log(`Multiply: ${cal.multiply(12, 5)}`); // Multiply: 60
+
+// Importing Defaults
+import greet from "./greet.js";
+
+console.log(greet("Sohail")); // Hello Sohail
+console.log(greet("Salman")); // Hello Salman
+
+// Re Exporting
+import { subtract } from "./utilities.js";
+
+console.log(subtract(10, 2)); // 8
+
+// Dynamic Imports
+async function loadModule() {
+  const module = await import("./math.js");
+
+  console.log(`From Dynamic Import: ${module.add(10, 20)}`); // Output: 30
+}
+
+loadModule();
+
+// Module caching
+import { increment } from "./counter.js";
+console.log(increment()); // Logs: Module Loaded
+console.log(increment()); // No additional log
+
+// Facade Pattern
+import MathUtils from "./mathUtil.js";
+console.log(MathUtils.add(2, 3)); // 5

03 - Chai aur Javascript/17 - Modules/utilities.js

@@ -0,0 +1 @@
+export { subtract } from "./math.js";