# Selection handles selection sort in ascendant order.
# It provides two methods, one for sorting the array in parameter and
# the other to return a sorted copy of the array
# The items of the array must support the <=> operator
#
# Author:: Tristan Claverie
# License:: MIT
class Selection

    # Returns a sorted copy of the array in parameter
    def self.sort(a)
        sorted = a.dup
        self.sort!(sorted)
        return sorted
    end

    # Sort the array by modifying it
    def self.sort!(a)
        (0..a.size-1).each do |i|
            min_idx = i
            min_elt = a[i]
            ((i+1)..a.size-1).each do |j|
                if (a[j] <=> min_elt) < 0
                    min_elt = a[j]
                    min_idx = j
                end
            end
            a[i], a[min_idx] = a[min_idx], a[i]
        end
    end

end

# Selection handles selection sort in ascendant order.
# It provides two methods, one for sorting the array in parameter and
# the other to return a sorted copy of the array
# The items of the array must support the <=> operator
#
# Author:: Tristan Claverie
# License:: MIT
class Selection

    # Returns a sorted copy of the array in parameter
    def self.sort(a)
        sorted = Array.new(a)
        self.sort!(sorted)
        return sorted
    end

    # Sort the array by modifying it
    def self.sort!(a)
        (0..a.size-1).each do |i|
            min_idx = i
            min_elt = a[i]
            ((i+1)..a.size-1).each do |j|
                if (a[j] <=> min_elt) < 0
                    min_elt = a[j]
                    min_idx = j
                end
            end
            a[i], a[min_idx] = a[min_idx], a[i]
        end
    end

end

--- 
+++ 
@@ -9,7 +9,7 @@
 
     # Returns a sorted copy of the array in parameter
     def self.sort(a)
-        sorted = Array.new(a)
+        sorted = a.dup
         self.sort!(sorted)
         return sorted
     end
Use dup method to duplicate the array
