Default parameters

 Default parameters

Default parameters allow you to set default values for function parameters. If a value is not provided for a parameter, the default value will be used instead. Here's an example:

function greet(name = 'world') {

  console.log(`Hello, ${name}!`);

}

greet(); // Output: Hello, world!

greet('John'); // Output: Hello, John!

In the code above, the greet function has a default parameter of 'world' for the name parameter. If a value is not provided for name, the default value will be used instead.