applyKeys -- apply a function to each key in a hash table

Synopsis

• Usage:

  applyKeys(H,f)

• Inputs:

  • H, a hash table
  • f, a function, with one argument
• Outputs:

  • a hash table, obtained by applying f to each key k in H

Description

i1 : H = new HashTable from {1 => a, 2 => b, 3 => c}

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

o1 : HashTable

i2 : applyKeys(H, k -> k + 100)

o2 = HashTable{101 => a}
               102 => b
               103 => c

o2 : HashTable

Caveat

See also

• applyPairs -- apply a function to each pair in a hash table
• applyValues -- apply a function to each value
• scanKeys -- apply a function to each key in a hash table or database