Benefit to the Reader

1. Readers of `Programmierung PUR' will become familiar with all three paradigms of programming, i.e. with functional programming, with object-oriented programming and with imperative programming. Readers may decide later themselves, which programming style to use in a specific case. This decision may vary within one project and even within one program. It might be recommended to use one style `here' and another style `there'.

2. The principles of programming taught in `Programmierung PUR' are so general that they can be applied to most programming languages. This means that readers will be able to easier learn new programming languages because they only have to learn to express the programming patterns as presented in `Programmierung PUR' in the new languages.
   

3. Readers will be able to work with five real-life programming languages.

4. The programming language Scheme is often offered as a scripting or extension language in combination with a software product. With the experience provided by this book it will be easier to take advantage of sophisticated features of the corresponding software product or tool.

   Software products that provide such a Scheme interface are the following:

   • Guile the official scripting language of the GNU Project of the Free Software Foundation is Scheme.
   • Gnome the widely spread desktop for the Linux operating system uses Guile as its scripting language.
   • Gimp one of the most powerful programs for the manipulation of pictures offers the scripting interface Script-Fu, which is basically Scheme.
   • DocBook a software package by the leading XML expert Norman Walsh, that allows to write books as XML-documents with automatic rendering possibilities in RTF, HTML or L^ATEX. DocBook uses DSSSL style sheets. DSSSL, Document Style Semantics and Specification Language, adopted by ISO, is Scheme.
   • ACIS 3D Geometric Modeler a software package from Spatial Corporation, that allows the creation and manipulation of 3D models. This package is imbedded in 225 software products from other companies including AutoCAD, TurboCAD and 3D Studio Max. The software is licensed by 575 corporations including NASA, Ford Motor Company and Daimler-Chrysler AG.

     The scripting interface for 3D-modelling is called Scheme AIDE, i.e. Scheme ACIS Interface Driver Extension, which is again Scheme.

5. The reader of `Programmierung PUR' learns to build an object system from scratch. This might be very useful, if the host language does not provide object-oriented programming. The EMACS-Editor provides an extension language called `EMACS Lisp'. This language does neither have its own object system nor does it provide `lexical scope'. With the help of of the technique shown in `Programmierung PUR' it was possible to build a `dynamic object system' for the EMACS-Editor.

   This object system is even dynamic, which, if applied to java, would extend and enhance the host language.

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