Java Reference
In-Depth Information
return type (that is, the return type is Void). If you need to call such operations,
you can use the
chain
expression, with this syntax:
anExpression -> anotherExpression -> lastExpression
Each expression is evaluated in sequence, but only the result of the last
expression is returned. For example:
person.setName('test') -> person
This chain expression sets the name of the person first, before it returns the
person object itself.
Create Expression
The
create
expression instantiates
new
objects of a given type:
new
Topic
Let Expression
The
let
expression lets you define local variables. The syntax is as follows:
let
v = expression
:
expression-with-v
This is especially useful together with a
chain
and a
create
expression. For
example:
Topic newTopic() :
let
t =
new
Topic : t.setName('A topic') -> t
;
Casting
The expression language is statically type checked, although sometimes it's nec-
essary to perform a cast. The syntax for casts is very Java-like:
((String)unTypedList.get(0)).toUpperCase()
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