add var

content.tex

@@ -221,8 +221,8 @@ \subsection{Variable \& Operations}
     \item They can be of serveral \kw{type}: number, string or boolean.
     \item They have no explicite type (like in Python, unlike C or Java).
     \item When not first declared in a function they are \kw{global}.
+    \item Use \kw{var} make it persistent once the macro is installed.
     \item You can \kw{assign} a value to a variable using operator \code{=}.
-    \item You can print the value of a variable using \code{print();}
     \end{itemize}
   \end{block}\only<presentation>{\vspace{-.3cm}}
   \begin{block}{Operations}