isEmpty () : Boolean

Returns true if self is empty; otherwise, returns false.

Expression	Result
Sequence{2, 1}->isEmpty()	false
Sequence{nil}->isEmpty	true
<class>.EmptyList->isEmpty	true

Example

Given Class Car:

Car.allinstances->subsequence(0,49)->isEmpty

The above will return true if the collection is empty.

Warning!

Never use ->isEmpty on a value type. The value will be converted to a list (with the value as its only item) and that will always evaluate as False.

See also: OCLOperators notEmpty