What is the output?

function sayHi(name) {
  return `Hi there, ${name}`;
}

console.log(sayHi());

You missed this one before

By default, arguments have the value of undefined, unless a value has been passed to the function. In this case, we didn't pass a value for the name argument. name is equal to undefined which gets logged.

In ES6, we can overwrite this default undefined value with default parameters. For example:

function sayHi(name = "Lydia") { ... }

In this case, if we didn't pass a value or if we passed undefined, name would always be equal to the string Lydia

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