_isEmpty
Tests whether the provided value is empty --
Function
Anything -> Thing Type._isEmpty
(exp) -> TrueOrFalse Type
- Receives
- A Thing, or a List
: Defining Context (optional) : The Property to check whether its value is empty
- exp (optional)
- An expression to apply to the received value
- Produces
- No if the list has anything in it; Yes if it is empty
There are several different versions of _isEmpty, depending on what you want to test:
Thing -> Property._isEmpty
Given a Thing, this checks whether it has Property and its value is empty.
List -> _isEmpty
Given a received List of any sort, this checks whether that List is empty.
Anything -> _isEmpty(exp)
This is the most general form -- it applies exp to the received value, and checks whether
the result is empty. For example, if you have a Bookcase, and want to check whether it is
empty of Books, you might say:
My Bookcase -> _isEmpty(Books)
