lib/facet/array/pos.rb in facets-0.9.0 vs lib/facet/array/pos.rb in facets-1.0.0

@@ -1,38 +1,76 @@
-require 'nano/array/pos.rb'
\ No newline at end of file
+class Array
+  # Returns the positive ordinal index given
+  # a cardinal position, 1 to n or -n to -1.
+  #
+  #   [1,2,3,4,5].pos(1)   #=> 0
+  #   [1,2,3,4,5].pos(-1)  #=> 4
+  #
+  def pos(i)
+    if i > 0
+      return i - 1
+    else
+      self.length + i
+    end
+  end
+end
+
+
+
+#  _____         _
+# |_   _|__  ___| |_
+#   | |/ _ \/ __| __|
+#   | |  __/\__ \ |_
+#   |_|\___||___/\__|
+#
+=begin test
+
+  require 'test/unit'
+
+  class TCArray < Test::Unit::TestCase
+
+    def test_pos
+      a = [1,2,3,4,5]
+      assert_equal( 0, a.pos(1) )
+      assert_equal( 4, a.pos(-1) )
+    end
+
+  end
+
+=end