shortest command to find if a directory exists

[stoneroses]

I would like to do this so that I can

if exists Dir then echo don't do anything
if not exists dir mkdir c:\thenewdirectory

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My current solution is the following.Any suggestion for something shorter?

dir c:\thenewdirectory\ /s >> c:\patches.txt

if exists c:\patches.txt  echo don't do anything
if not exists c:\patches.txt mkdir c:\thenewdirectory

[GuruGary]

This is the shortest solution I can think of based on your example:

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if not exist c:\thenewdirectory md c:\thenewdirectory
But you could always just use the MD command which will create the directory unless it already exists like this:

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md c:\thenewdirectory>NUL