Javascript Syntax Development Tutorials, Guides & Insights

• Variables are accessible within the entire function they are declared in.
• Example:

     function test() {
       var y = 20;
       console.log(y); // 20
     }
     console.log(y); // Error: y is not defined

• In a browser:
• Open the console (Ctrl+Shift+J or Cmd+Option+J) and type the code.
• In Node.js:
• Save the code in a file (e.g., hello.js) and run it using:

       node hello.js