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#? -- check for presence of elements

See also:

  • # -- length, or access to elements

    • Methods for #? :

  • BasicList #? ZZ -- check for element in list
  • Database #? String -- check for value in database
  • HashTable #? Thing -- check for value in hash table
  • Set #? Thing -- test set membership
  • String #? ZZ -- check for character in string

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