How to inspect an object's property if the property name is an empty string?

Question

Javascript objects' properties can be named with the empty string, for example:

foo = { 
    "" : "bar"
}

Dot notation does not seem to be able to call this property. Console output:

foo.
>> "missing name after . operator"

How would you call the "" property?

Answer 1

Use an empty string as a key with the bracket syntax:

foo[""]