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5.7.2 Why Scheme is More Hackable Than C ¶

Underlying Guile’s value proposition is the assumption that programming in a high level language, specifically Guile’s implementation of Scheme, is necessarily better in some way than programming in C. What do we mean by this claim, and how can we be so sure?

One class of advantages applies not only to Scheme, but more generally to any interpretable, high level, scripting language, such as Emacs Lisp, Python, Ruby, or TeX’s macro language. Common features of all such languages, when compared to C, are that:

• They lend themselves to rapid and experimental development cycles, owing usually to a combination of their interpretability and the integrated development environment in which they are used.
• They free developers from some of the low level bookkeeping tasks associated with C programming, notably memory management.
• They provide high level features such as container objects and exception handling that make common programming tasks easier.

In the case of Scheme, particular features that make programming easier — and more fun! — are its powerful mechanisms for abstracting parts of programs (closures — see The Concept of Closure) and for iteration (see Iteration mechanisms).

The evidence in support of this argument is empirical: the huge amount of code that has been written in extension languages for applications that support this mechanism. Most notable are extensions written in Emacs Lisp for GNU Emacs, in TeX’s macro language for TeX, and in Script-Fu for the Gimp, but there is increasingly now a significant code eco-system for Guile-based applications as well, such as Lilypond and GnuCash. It is close to inconceivable that similar amounts of functionality could have been added to these applications just by writing new code in their base implementation languages.