ITERATE

• Macro ITERATE (&body body)
  Jonathan Amsterdam's powerful iteration facility
• Macro ITER (&body body &environment env)
  Jonathan Amsterdam's powerful and extensible iteration facility, providing multiple accumulation, generators, memory of previous iterations, over 50 clauses to start with and a Lisp-like syntax. Evaluate (iterate:display-iterate-clauses) for an overview of clauses
• Macro DEFMACRO-CLAUSE (clause-template &body body)
  Create your own iterate clauses
• Macro DEFMACRO-DRIVER (clause-template &body body)
  Create iterators which may also be used as generators
• Function DISPLAY-ITERATE-CLAUSES (&optional clause-spec)
• Macro DEFSYNONYM (syn word)
  Makes SYN a synonym for the existing iterate keyword WORD.
• Macro DEFCLAUSE-SEQUENCE (element-name index-name &key access-fn size-fn element-type sequence-type element-doc-string index-doc-string)
  A simple way to define a simple FOR ... &sequence clause
• Macro DSETQ (template value)
  Destructuring assignment; supports both (VALUES ...) for destructuring a multiple-value form and NIL as a variable name, meaning to ignore that position, e.g. (DSETQ (VALUES (a . b) nil c) form)
• Function INITIALLY (&rest forms)
  Lisp forms to execute before loop starts
• Function AFTER-EACH (&rest forms)
  Lisp forms to execute after each iteration
• Function ELSE (&rest forms)
  Lisp forms to execute if the loop is never entered
• Function FINALLY (&rest forms)
  Lisp forms to execute after loop ends
• Function FINALLY-PROTECTED (&rest forms)
  Lisp forms in an UNWIND-PROTECT after loop ends
• Function IF-FIRST-TIME (then &optional else)
  Evaluate branch depending on whether this clause is met for the first time
• Function FIRST-TIME-P
  True when evaluated for the first time
• Function FIRST-ITERATION-P
  True within first iteration through the body
• Function IN (block-name &rest forms)
  Process forms in a named Iterate block
• Function NEXT (var &optional (n 1))
  Explicitly step a driver variable
• Macro FINISH
  Leave the loop gracefully, executing the epilogue
• Macro TERMINATE
  Use within FOR ... DO-/NEXT clause to end the iteration
• Macro NEXT-ITERATION
  Begin the next iteration
• Macro LEAVE (&optional value)
  Exit the loop without running the epilogue code