feat: add functions explanations

Gildaciolopes · Gildaciolopes · commit 708880fc6ef7 · 2025-03-13T18:18:14.000-03:00
diff --git a/basics/functions.js b/basics/functions.js
@@ -0,0 +1,42 @@
+// &#128204; JavaScript Basics - Functions
+
+// Welcome to the fifth section of the JavaScript Basics tutorial!
+// Here, you'll learn how to declare and use functions in JavaScript.
+
+// Function Declaration (Named Function)
+function greet(name) {
+  return "Hello, " + name + "!";
+}
+console.log(greet("Alice"));
+
+// Function Expression (Anonymous Function)
+const add = function (a, b) {
+  return a + b;
+};
+console.log("Sum:", add(5, 3));
+
+// Arrow Function (ES6+)
+const multiply = (x, y) => x * y;
+console.log("Multiplication:", multiply(4, 2));
+
+// Default Parameters
+function sayHello(name = "Guest") {
+  console.log("Hello, " + name);
+}
+sayHello();
+
+// Rest Parameters
+function sumAll(...numbers) {
+  return numbers.reduce((total, num) => total + num, 0);
+}
+console.log("Total Sum:", sumAll(1, 2, 3, 4, 5));
+
+// Callback Functions
+function processArray(arr, callback) {
+  return arr.map(callback);
+}
+const numbers = [1, 2, 3, 4];
+const doubled = processArray(numbers, (num) => num * 2);
+console.log("Doubled Array:", doubled);
+
+// &#128161; Practice writing different types of functions!
