Editing Foreach loop (section)

=== ParaSail ===
The [[ParaSail (programming language)|ParaSail]] parallel programming language supports several kinds of iterators, including a general "for each" iterator over a container:

<syntaxhighlight lang="parasail">
var Con : Container<Element_Type> := ...
// ...
for each Elem of Con concurrent loop  // loop may also be "forward" or "reverse" or unordered (the default)
  // ... do something with Elem
end loop
</syntaxhighlight>

ParaSail also supports filters on iterators, and the ability to refer to both the key and the value of a map. Here is a forward iteration over the elements of "My_Map" selecting only elements where the keys are in "My_Set":
<syntaxhighlight lang="parasail">
var My_Map : Map<Key_Type => Univ_String, Value_Type => Tree<Integer>> := ...
const My_Set : Set<Univ_String> := ["abc", "def", "ghi"];

for each [Str => Tr] of My_Map {Str in My_Set} forward loop
   // ... do something with Str or Tr
end loop
</syntaxhighlight>