From mboxrd@z Thu Jan  1 00:00:00 1970
From: Tom Prince <tom.prince@ualberta.net>
Subject: Re: Elisp programming style
Date: Fri, 28 Oct 2011 13:43:14 -0400
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To: Thorsten <quintfall@googlemail.com>, emacs-orgmode@gnu.org

Perhaps 

,-----------------------------------------------------------
| (defun main-function (args)                               
| (let ((var (assoc :key1 args)))  ; extracting var once    
| ...                                                       
| (helper-function1 ... var ...) ; inside let using var     
| (helper-function2 ... var ...) ; inside let using var     
| ))                                                        
|                                                           
| (defun helper-function1 (var')                            
| ...                                                       
| )                                                         
|                                                           
| (defun helper-function2 (var')                            
| ...                                                       
| )                                                         
`-----------------------------------------------------------

or

,-------------------------------------------------------------
| (defun get-key1 (args) (assoc :key1 args))                  
| (defun main-function (args)                                 
| (let ((value (get-key1 args))   ; extracting var 1st time   
| ...                                                         
| )                                                           
| (helper-function1 ...) ; outside let                        
| (helper-function2 ...) ; outside let                        
| )                                                           
|                                                             
| (defun helper-function1 (args)                              
| (let ((value (get-key1 args))   ; extracting var 2nd time   
| ...                                                         
| ))                                                          
|                                                             
| (defun helper-function2 (args)                              
| (let ((value (get-key1 args))   ; extracting var 3rd time   
| ...                                                         
| ))                                                          
`-------------------------------------------------------------


I likely wouldn't suggest the second, unless get-key1 was actually
something more complicated than your example.

  Tom