select(HashTable,Function) -- select part of a hash table

Synopsis

• Function: select

• Usage:

  select(v,f)

• Inputs:
  • v, a hash table
  • f, a function, returning either true or false
• Outputs:
  • a hash table, whose pairs are those key-value pairs (k,w) of the hash table v that yield true when the function f is applied to the value w.

Description

i1 : x = new HashTable from { x => 1, y => 2, z => 3 }

o1 = HashTable{x => 1}
               y => 2
               z => 3

o1 : HashTable

i2 : select(x,odd)

o2 = HashTable{x => 1}
               z => 3

o2 : HashTable

See also

• partition -- partition a set or list by values of a function