Syntax
apply operationName (element [, additionalParameter]) to destinationArrayName
SemanticsApplies an EAL or Class operation (operationName) to each element of an array (destinationArrayName).
element is a keyword  and denotes any single element of destinationArrayName.
SubstitutablesoperationNameCan be any EAL or class operation name.
anArray, destinationArrayNameCan be any variable or object attribute having the type Array.
Examples
set changedElements = apply concat(element, "_x") to inputContainer.myList;
set normalizedElements = apply normalizeSpaces(element) to inputContainer.myList;
apply element.calculateAmmount() to exchangesList;

Example File (Builder projects E2E Action Language/Array and Basic Modeling/ClassOperation):

<your example path>\E2E Action Language\Array\uml\arrayApply.xml
<your example path>\Basic Modeling\ClassOperation\uml\callClassOperations.xml

This example shows how to append _x to each element of the attribute array myList. Subsequently, it normalizes the spaces of each myList string.

Figure:apply Example