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Version: 4.x

Filter (FILTER)

The filter operator creates a property that returns TRUE if the object collection matches the current filter of the specified object group, and NULL if it does not.


To declare a property that determines matching the filter use the FILTER operator.


CLASS Store;
name = DATA STRING[100] (Store);

FORM stores
OBJECTS s = Store
countF 'Number of filtered warehouses' = GROUP SUM 1 IF [ VIEW stores.s](Store s);
orderF 'Order in an object group' (Store s) = PARTITION SUM 1 IF [ FILTER stores.s](s) ORDER [ ORDER stores.s](s), s;
setNameX 'Add X to name'() {
k() <- 0;
FOR [ FILTER stores.s](Store s) ORDER [ ORDER stores.s](s) DO {
k() <- k() + 1;
name(s) <- 'X' + k() + name(s);