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

Synopsis

• Usage:

  scanKeys(t, f)

• Inputs:
  • t, a hash table, or Database
  • f, a function

Description

i1 : t = hashTable {{1,8},{2,20},{3,4},{4,20}}

o1 = HashTable{1 => 8 }
               2 => 20
               3 => 4
               4 => 20

o1 : HashTable

i2 : scanKeys(t, print)
1
2
3
4

i3 : scanKeys(t, k -> if k>2 then print t#k)
4
20

Caveat

See also

• hash tables
• applyKeys -- apply a function to each key in a hash table
• keys -- keys used in a hash table, dictionary, or database
• scan -- apply a function to each element in a list or sequence
• scanPairs -- apply a function to the pairs in a hash table
• scanValues -- apply a function to each value in a hash table or database