OQL javascript code to count packages with most class definitions

permgen.js

// Count packages with most class definitions (excluding class definitions in java.lang.*)

var set = {};
top(map(unique(map(filter(heap.classes(), function(it) {
	return !it.name.substr(0,it.name.lastIndexOf('.')).startsWith('java.lang');
}), function(it) {
	var pName = it.name.substr(0,it.name.lastIndexOf('.'));
  if (set[pName]) {
     set[pName]++;
  } else {
    set[pName] = 1;
  }
  
  return pName;
})), function(it) {
  return {name: it, classDefinitionCount: set[it]}
}), 'rhs.classDefinitionCount - lhs.classDefinitionCount');