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The cond form is convenient for expressing nested
if-expressions, where each ``else'' branch but the last
introduces a new if. Thus, the form
(if (char<? c #\c) -1
(if (char=? c #\c) 0
1))
can be rewritten using cond as:
(cond ((char<? c #\c) -1)
((char=? c #\c) 0)
(else 1))
The cond is thus a multi-branch conditional. Each
clause has a test and an associated action. The first
test that succeeds triggers its associated action. The
final else clause is chosen if no other test
succeeded.
The cond actions are implicit begins.
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