lib/exec_if.rb in exec_if-0.1.0 vs lib/exec_if.rb in exec_if-0.2.0

@@ -1,11 +1,18 @@
 require "exec_if/version"
 
 class Object
   def exec_if(obj, &blk)
-    if obj
-      blk.call(self, obj)
-    else
+    case obj
+    when Proc
+      obj.call(self) ? blk.call(self, obj) : self
+    when Symbol
+      public_send(obj) ? blk.call(self, obj) : self
+    when String
+      eval(obj) ? blk.call(self, obj) : self
+    when Object
+      obj ? blk.call(self, obj) : self
+    when nil, false
       self
     end
   end
 end