Apply command to this area only

Question

What is the syntax for apply command on specific area only?
What I mean is something like:
newcommand{somevariable}{3}
somevariable %3
-- some block which doesn't effect the outsize --
renewcommand{somevariable}{5}
somevariable %5
-- end of the block --
somevariable %3

I don't want to use renewcommand agian outside the block. 
Is there a way to do it? Thank you!

David Carlisle · Answer

Definitions with newcommand (along with most settings, such as font settings other than latex counter settings) are local so scoped by andy brace group {....} or any environment begin{..} .... end{..}
This typesets 3 5 3
documentclass{article}

begin{document}

newcommand{somevariable}{3}
somevariable %3

{
renewcommand{somevariable}{5}
somevariable %5
}

somevariable %3

end{document}

Apply command to this area only

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