I've become accustomed to being able to edit my work as I go, and find it frustrating to write things on paper. I would say that you were lucky they gave you a white board! On the other hand, with very little practice you will find it easier to do a 'code performance' during an interview.

Not that long ago one of the managers where I work came by my desk and asked me if there was an easy way to count the number of lines in a file. He wanted to do this on an NT box, which didn't have CW. So I grabbed a pen and started writing Perl on my white board.

# First draft:
perl -we "@ARGV=qq'\42file name\42';1 while <>;print $.,$/"

# Quick, grab the eraser, that sol'n is too long!
# Second draft:
perl -we "1 while <>;print $.,$/" file_name
[download]

While I thought the solution was simple, he eventually decided it simpler to install CYGWIN on the machine (which includes CW) because he didn't understand how the Perl worked.