member[procedure] member obj list
R5RS: Returns the first sublist of list whose car is equal?
to obj.
If obj does not occur in list, then #f (not the empty list) is returned.
See also memq, memv.
[procedure] member obj list [=]
SRFI-1: This is an upper-compatible extension of R5RS member,
to allow the client to pass in an optional equality procedure = used to
compare keys.
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