How do I write a function in JavaScript?

To write a function in JavaScript, you can use the following syntax:

1function functionName(parameters) {
2  // code to be executed
3  return something; // optional
4}

For example, a simple function that adds two numbers would look like this:

1function addNumbers(x, y) {
2  return x + y;
3}

Functions in JavaScript allow you to group code to be executed, making your code more organized and easier to understand. Happy coding!