GroIMP wiki - 01_user_documentation:07_rgg_xl:02_xl:09_java_addition
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For statement
The for statement is enhanced in XL. It can take two additional type of arguments: generators and DisposableIterators.
Generators
When the argument of the for statement is a generator expression, the iteration is over every yielded value of the expression. Using this type of iteration, we may write:text/html2025-08-20T08:32:31+00:00Anonymous (anonymous@undisclosed.example.com)Implicit conversions
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Implicit conversions
It is possible to convert object and primitive into other objects implicitly. By default, the only implicit conversions enabled are the boxing and unboxing of primitive (e.g. from Integer to int) and RGG files also automatically include the Float to Double implicit conversion.text/html2025-08-20T08:32:22+00:00Anonymous (anonymous@undisclosed.example.com)Modifiers
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Modifiers
The XL language include additional modifiers which can be used when declaring variables.
Const
In the Java programming language, constants can be defined by field declarations with both modifiers static and final. As a simplification, the new modifiertext/html2025-08-20T08:32:22+00:00Anonymous (anonymous@undisclosed.example.com)Operators
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Operators
The XL programming language defines several new operators, including arrow operators whose main purpose is to be used within production statements and which have no built-in meaning, i. e., they always refer to operator methods. The new operatorstext/html2026-03-27T16:46:54+00:00Anonymous (anonymous@undisclosed.example.com)Overload operator
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Overload operator
Operators can be overloaded in XL by declaring the method operator$NAME_OF_OPERATOR(var , var ){}.
The list of operators in groimp is available at: xl specification.
module A(float len) extends Sphere(0.1)
{
public static boolean operator$com (A a) {
return true;
}
// public static A operator$add (A a, int b) {
public static A operator+ (A a, int b) {
a.len += b;
return a;
}
public void operator++(){
++this.len;
}
}
public void run ()
…text/html2025-09-05T13:21:13+00:00Anonymous (anonymous@undisclosed.example.com)Expression list
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Expression list
In RGG, for Java as well as XL blocks it is possible to combine several expressions in one expression, using brackets and separating them by comma. The expressions will then be executed in order from left to right, and the last one on the right defines the return value of the surrounding expression list.text/html2025-12-12T12:27:56+00:00Anonymous (anonymous@undisclosed.example.com)XL Lambda function
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XL Lambda function
Since the java version used in GroIMP does not yet support the java lambda functions, GroIMP comes with a set of own lambda functions.
A Lambda function or anonymous function is a function that is not connected to an identifier and can be handled like a variable.