The Boolean constructor creates boolean objects (not to be confused with boolean primitives). The boolean objects are not very useful and are listed here for the sake of completeness.

>>> var b = new Boolean();
>>> b.valueOf()

false

>>> b.toString()

"false"

A boolean object is not the same as a boolean primitive value. As you know, all objects are truthy:

>>> b === false

false

>>> typeof b

"object"

Boolean objects don't have any properties other than the ones inherited from Object.