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23.8 Fold, unfold and map

The left–folding operator is the fundamental list iterator, the right–folding operator is the fundamental list recursion operator.

• lists fold examples:  Folding usage examples.
• lists fold rnrs:  Folding with R6RS style.
• lists fold traditional:  Folding with traditional style.
• lists fold derived:  Derived folding.
• lists fold pair:  Folding pairs.
• lists fold reduce:  Reducing.
• lists fold unfold:  Unfolding.
• lists fold map:  Mapping.
• lists fold foreach:  Producing side effects.