General ⇒ Why \newsavebox, \usebox, \savebox instead of \newcommand?

[dl3fo3]

Why use \newsavebox, \usebox, \savebox when \newcommand seems to do the job too?

\newsavebox, \usebox, and \savebox :

Code: Select all

% Create the holders we will need for our work
\newlength{\mytitleheight}
\newsavebox{\mytitletext}
% Create the reference text for measures
\savebox{\mytitletext}{%
  \Large\bfseries This is our title%
}
\settoheight{\mytitleheight}{\usebox{\mytitletext}}
% Now creates the actual object in our document
\framebox[\textwidth][l]{%
  \rule{5em}{\mytitleheight}%
  \hspace{2mm}%
  \usebox{\mytitletext}%
}

Doing the same with \newcommand:

Code: Select all

\newlength{\mahtitleheight}
\newcommand{\mahtitletext}{%
  \Large\bfseries This is ahr title%
}
\settoheight{\mahtitleheight}{\mahtitletext}
\framebox[\textwidth][l]{%
  \rule{5em}{\mahtitleheight}%
  \hspace{2mm}%
  \mahtitletext%
}