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\subsection{.:}
\label{labprepend}
\noindent Name: \textbf{.:}\\
\phantom{aaa}add an element at the beginning of a list.\\[0.2cm]
\noindent Library name:\\
\verb| sollya_obj_t sollya_lib_prepend(sollya_obj_t, sollya_obj_t)|\\[0.2cm]
\noindent Usage:
\begin{center}
\emph{x}\textbf{.:}\emph{L} : (\textsf{any type}, \textsf{list}) $\rightarrow$ \textsf{list}\\
\end{center}
Parameters:
\begin{itemize}
\item \emph{x} is an object of any type.
\item \emph{L} is a list (possibly empty).
\end{itemize}
\noindent Description: \begin{itemize}
\item \textbf{.:} adds the element \emph{x} at the beginning of the list \emph{L}.
\item Note that since \emph{x} may be of any type, it can be in particular a list.
\end{itemize}
\noindent Example 1:
\begin{center}\begin{minipage}{15cm}\begin{Verbatim}[frame=single]
> 1.:[|2,3,4|];
[|1, 2, 3, 4|]
\end{Verbatim}
\end{minipage}\end{center}
\noindent Example 2:
\begin{center}\begin{minipage}{15cm}\begin{Verbatim}[frame=single]
> [|1,2,3|].:[|4,5,6|];
[|[|1, 2, 3|], 4, 5, 6|]
\end{Verbatim}
\end{minipage}\end{center}
\noindent Example 3:
\begin{center}\begin{minipage}{15cm}\begin{Verbatim}[frame=single]
> 1.:[||];
[|1|]
\end{Verbatim}
\end{minipage}\end{center}
See also: \textbf{:.} (\ref{labappend}), \textbf{@} (\ref{labconcat})
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