The `=` operator in the object declaration is defining defaults for the
destructuring. If the object being destructured doesn't have that property,
the value on the right hand side of the `=` operator is used.
The `= {}` provides a default object to de-structure, making the entire
argument optional. Without that you would be trying to de-structure
`undefined` when you call `postToMailingList()` which would be an error.
If you don't pass an object, `{}` is used because it is the default. If you
pass an empty object then that empty object is used (i.e. still `{}`).
P.S. please just inline your code samples and use something like GitHub
flavoured markdown to format your posts (i.e. code blocks begin and end with
three back-tick characters) That way they will be quick and easy to read on
http://esdiscuss.org/topic/optional-named-arguments You can see plenty of
examples by clicking on "View Original" (e.g. I re-formatted your last post for
you)
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