In this chapter, we introduce the basic concepts that underpin the
elegance and power of the Scheme language.
Readers who already possess a background knowledge of Scheme may happily
skip this chapter. For the reader who is new to the language, however,
the following discussions on data, procedures, expressions and closure
are designed to provide a minimum level of Scheme understanding that is
more or less assumed by the reference chapters that follow.
The style of this introductory material aims about halfway between the
terse precision of R5RS and the discursive randomness of a Scheme
tutorial.
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