hasItem
>>-hasItem(item-+--------+-)-----------------------------------------><
+-,index-+
Returns 1 (true) if the relation
contains the member item
[item]
,
0 (false).
If
[index]
is specified, hasIndex()
will only return true if the relation contains the pairing of
[item]
associated with index
[index]
.
Item and index equality is determined by using the == method.
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