assoc[procedure] assoc obj alist
R5RS: finds the
first pair in alist whose car field is obj, and returns
that pair. If no pair in alist has obj as its car, then #f
is returned. Uses equal? to compare.
See also assq, assv
[procedure] assoc obj alist [=]
SRFI-1 extends R5RS to allow the client to pass in an optional
equality procedure = used to compare keys.
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