feat: add variables explanations

Gildaciolopes · Gildaciolopes · commit 58698331b4a6 · 2025-03-13T02:43:43.000-03:00
diff --git a/basics/variables.js b/basics/variables.js
@@ -0,0 +1,39 @@
+// &#128204; JavaScript Basics - Variables
+
+// Welcome to the third section of the JavaScript Basics tutorial!
+// Here, you'll learn how to declare and use variables in JavaScript.
+
+// What are Variables?
+// Variables are used to store data values. JavaScript provides three ways to declare variables:
+
+// &#127991;&#65039; var - Function-scoped, can be redeclared and updated
+var city = "New York";
+console.log("var:", city);
+
+// &#128274; let - Block-scoped, can be updated but not redeclared
+let country = "USA";
+console.log("let:", country);
+
+// &#128272; const - Block-scoped, cannot be updated or redeclared
+const PI = 3.1416;
+console.log("const:", PI);
+
+// &#9888;&#65039; Difference between var, let, and const
+function testScope() {
+  if (true) {
+    var a = "I am var"; // Accessible outside the block
+    let b = "I am let"; // Block-scoped
+    const c = "I am const"; // Block-scoped
+  }
+  console.log(a); // Works
+  // console.log(b); // Error
+  // console.log(c); // Error
+}
+testScope();
+
+// &#128161; Best Practices
+// - Use `const` by default unless the value needs to change.
+// - Use `let` if the value needs to be reassigned.
+// - Avoid `var` due to potential scoping issues.
+
+// &#128640; Practice declaring variables using var, let, and const.
