lib/core/facets/enumerable/collect.rb in facets-2.0.5 vs lib/core/facets/enumerable/collect.rb in facets-2.1.0

@@ -111,10 +111,16 @@
     inject(s) do |k, i|
       yield(k, i); k
     end
   end
 
+  # TODO Faster implementation? Verify equivalency.
+  #def injecting(res, &block)
+  #  ([res]*length).zip(to_a).each(&block)
+  #  res
+  #end
+
   # The #group_by method is best explained by example.
   #
   #   (1..5).partition_by { |n| n % 3 }
   #        #=> { 0 => [3], 1 => [1, 4], 2 => [2,5] }
   #
@@ -148,11 +154,10 @@
   #    [ ['a'], ['is'], ['this', 'test'] ]
   #
   # CREDIT Erik Veenstra
 
   def cluster_by(&b)
-    #group_by(&b).values
-    group_by(&b).sort.transpose.pop
+    group_by(&b).sort.transpose.pop || []   # group_by(&b).values ?
   end
 
   # Split on matching pattern.
   #
   # ['a1','b1','a2','b2'].divide(/^a/)