Javascript Variables 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

JavaScript supports several basic data types, including:

• String: Text, enclosed in quotes.
• Number: Numeric values.
• Boolean: True or false.
• Array: A list of values.
• Object: A collection of key-value pairs.