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scanKeys -- apply a function to each key in a hash table or database

scanKeys(x,f) -- apply the function f to each key used in the hash table or database x.

This function requires an immutable hash table. To scan the keys in a mutable hash table, use scan(keys x, f).

Ways to use scanKeys :

  • scanKeys(Database,Function)
  • scanKeys(HashTable,Function)

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