keys -- keys used in a hash table, dictionary, or database

Synopsis

• Usage:

  keys t

• Inputs:
  • t, a hash table, a dictionary, or a database,
• Outputs:
  • a list, the keys occurring in the hash table t

Description

i1 : x = new HashTable from {a => 1, b => 2}

o1 = HashTable{a => 1}
               b => 2

o1 : HashTable

i2 : keys x

o2 = {a, b}

o2 : List

See also

• hash tables
• applyKeys -- apply a function to each key in a hash table
• pairs -- list the pairs in a hash table, dictionary, or basic list
• scanKeys -- apply a function to each key in a hash table or database
• values -- values in a hash table
• # -- length or access to elements
• #? -- check existence of value in a list, hash table, database, or string