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Set #? Thing
-- test set membership
Synopsis:
Operator:
#?
-- check for presence of elements
Input:
an instance of class
Set
.
an instance of class
Thing
.
Output:
an instance of class
Boolean
.
Next more general method:
HashTable #? Thing
-- check for value in hash table
x#?i
-- tests whether
i
is a member of the set
x
.
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