{{end}}
+```
+
+An alternative way of writing the "if" and then referencing the same value is
+to use "with" instead, which rebinds the pointer `.` within its scope, and
+elides the scope if the variable is absent:
+
+```
+{{with .Site.Params.TwitterUser}}{{end}}
+```
+
+Finally, if you want to pull "magic constants" out of your layouts, you can do
+so, such as in this example:
+
+```
+