HashTable #? Thing -- check for value in hash table

HashTable #? Thing -- check for value in hash table

Synopsis:

Operator: #? -- check for presence of elements

Input:

an instance of class HashTable.

an instance of class Thing.

Output:

an instance of class Boolean.

x#?i -- tells whether there is a value associated to the key i stored in the hash table x.

See also:

HashTable # Thing -- get value from hash table