What will the output be if a function is invoked without passing an expected argument that has a default parameter value?

When a function is defined with default parameter values in JavaScript, if the function is invoked without passing an argument for that parameter, the function will utilize the default value specified in its definition. This is a feature of JavaScript that allows for more flexible function definitions and helps prevent errors related to missing arguments.

For example, consider a function defined as follows:

function greet(name = 'Guest') {

return `Hello, ${name}!`;

}

If this function is called without an argument like greet(), it will output "Hello, Guest!" because the default value 'Guest' is used in the absence of any argument.

This behavior promotes cleaner code by eliminating the need for manual checks to provide default values at the start of the function's execution. Consequently, using a default parameter simplifies function calls and improves readability, allowing developers to focus more on the functionality rather than defensive programming practices related to argument handling.