i1 : H = new HashTable from {1 => 10, 2 => 15, 3 => 20} o1 = HashTable{1 => 10} 2 => 15 3 => 20 o1 : HashTable
i2 : applyKeys(H, k -> k//2, max) o2 = HashTable{0 => 10} 1 => 20 o2 : HashTable