How to verify whether a directory exists

[B. Fongo]

I want to use mkdir(blah blah, o777), but want to first find out  
whether the directory "blah blah" exists.
I'm not if the -e option will bw right here. Let's say:

       unless (-e blah_blah) mkdir(blah_blah, 0777);
# Is this okay?
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