Array.$A()
Array.$A(attributename)
Assuming the array of objects, is a parameter string for an attribute (say attrs.x) and extracts that attribute for each array element object.
e.g. DebugSelectorObjects.$A("attrs.x") where DebugSelectorObjects is an array of objects.
a=[{a:3,b:5},{a:45,b:43}];
a.$A("a")
3 45