[Tex/LaTex] Adding colon or dash after section

Question

I changed the format of subsubsection to remove the line breaks after them using titlesec package and the command

\titleformat{\subsubsection}[runin]{\normalfont\bfseries}{\thesubsubsection.}{3pt}{}

Complete code:

\documentclass{article}
\usepackage{titlesec}

\titleformat{\subsubsection}[runin]{\normalfont\bfseries}{\thesubsubsection.}{3pt}{}
\begin{document}

\section{Section one}
Some text
\subsection{Subsection one one}
Some text
\subsubsection{Subsubsection one one one}
This is subsubsection. Blah blah blah.

\end{document}

This produces the subsubsection title immediately followed by the body.
Now, I want to add a colon (or dash) after the title. e.g.

1.1.1. Subsubsection one one one: This is subsubsection. Blah blah blah.

Is there a way to do this?

Answer 1

Use the optional argument of titleformat meant for after code:

\titleformat{\subsubsection}[runin]{\normalfont\bfseries}{\thesubsubsection.}{3pt}{}[:]   %%<--- this one

Code:

\documentclass{article}
\usepackage{titlesec}

\titleformat{\subsubsection}[runin]{\normalfont\bfseries}{\thesubsubsection.}{3pt}{}[:]
\begin{document}

\section{Section one}
Some text
\subsection{Subsection one one}
Some text
\subsubsection{Subsubsection one one one}
This is subsubsection. Blah blah blah.

\end{document}