function greet(name) {
  console.log("Hello, " + name + "!");
}

greet("John");

In this code, we define a function called greet that takes a name parameter. Inside the function, we use the console.log method to print the greeting message to the console.

To use this function, we call it with a specific name as an argument. In this case, we are calling greet("John"), which will output “Hello, John!” to the console.

This is just a basic example of how JavaScript functions can be implemented. The functionality can be expanded or modified based on your specific requirements.

References:

• MDN Web Docs - JavaScript Introduction
• W3Schools - JavaScript Functions