How do I use variables in JavaScript functions?

How do I use variables in JavaScript functions?

In JavaScript, you can declare variables using var, let, or const and use them within functions. For example, you can define a function that takes parameters and uses them as variables.

Can you show me an example of a function using variables?

Sure! Here's a simple example:

function greet(name) {
    let message = 'Hello, ' + name + '!';
    return message;
}
console.log(greet('Alice')); // Output: Hello, Alice!

What is the difference between let and var?

let is block-scoped, meaning it is only accessible within the block it is defined. var is function-scoped, so it can be accessed throughout the function.

Can I use global variables in functions?

Yes, you can use global variables inside functions, but it's generally better to pass variables as parameters to avoid potential conflicts.