Writing and Running Code

1. Giving Instructions to a Computer

JavaScript serves as a versatile programming language, empowering developers to command computers and create dynamic, interactive web pages. Functioning as a client-side scripting language, JavaScript enhances user experiences by modifying HTML and CSS content and behavior.

2. Writing JavaScript Code

JavaScript code can be seamlessly integrated into HTML documents or stored in separate files. The language supports both procedural and object-oriented programming, enabling tasks like calculations, data manipulation, and responding to user interactions. Let's explore a basic example:

In this snippet, a variable greeting is declared, assigned a string, and then the message is logged to the console using console.log().

3. Running Our Code Using the Console

The browser console, accessible through developer tools, facilitates testing and debugging. Open it (usually with F12 or right-clicking and selecting "Inspect"), navigate to the "Console" tab, and input JavaScript code directly.

For instance, copy the previous code into the console and press Enter to view the output. The console aids in variable inspection, error identification, and understanding code execution.

4. Syntax

JavaScript syntax establishes rules for proper code interpretation. Essential syntax elements include:

• Variables:

  var x = 10;

• Functions:

  function addNumbers(a, b) { return a + b; }

• Conditional Statements:

  if (x > 5) { console.log("x is greater than 5"); } else { console.log("x is not greater than 5"); }

• Loops:

  for (var i = 0; i < 5; i++) { console.log(i); }

Mastering syntax is crucial for crafting effective JavaScript code. Regular practice and exploration will enhance proficiency.