extend Collection with [Element: 'Any Object' that 'Provides equivalence comparison'] {
 function 
 'apply (transformer: fn (item: Self.Element) -returns: Nothing) 
 to all elements in collection, 
 but ignore anything that satisfy (predicate: fn (item: Self.Element) -returns: iso Bool)' 
 -returns: Nothing -body: {
  'for item in (self) {
   'if { predicate (item=item) .== (.yes) } than {
    transformer (item=item)
   } else {
    itterator.'move to next item'
   }' //closures can be written without enclosing () paranthesis
  }'
 }
}