Ruby Set difference function

The ruby difference function is applied to the set and this function takes a parameter (enumerable objects). This function duplicates the implemented set and extracts its objects by the given parameter object that is the same in the parameter. And returns a new resultant set. for example.

# Ruby set difference example
require "set"

# Display set element
def printSet(record)
    record.each {
        |x|
        # Display object value  
        print("  ",x)  
    }
    print("\n")
end

# Given set a,b
a = Set.new(['a','z' ,'p' ,'i'])
b = Set.new(['c','i','l','a'])

# Calculate difference
c = a.difference(b)
d = b.difference(a)

# Display set values
puts "Set A"
printSet(a)
puts "Set B"
printSet(b)
puts "Set C"
printSet(c)
puts "Set D"
printSet(d)

Set A
  a  z  p  i
Set B
  c  i  l  a
Set C
  z  p
Set D
  c  l

Parameter type must be an enumerable type such as array, set etc. Let see other example.

# Ruby set difference example B
require "set"

a = Set.new(['a','z' ,'p' ,'i'])

# Calculate difference
b = a.difference(['p',1,2])
c = a.difference(a)

# Display set values
print("Set A",a.to_a)   # Set A["a", "z", "p", "i"]
print("\nSet B",b.to_a) # Set B["a", "z", "i"]
print("\nSet C",c.to_a) # Set C[]

Set A["a", "z", "p", "i"]
Set B["a", "z", "i"]
Set C[]