Ways to check if AD user already exist before creating a new AD user

Question

Hi all,
I need to import users into a new active directory domain. I will make an extract from the old active directory domain.
The thought process on paper is something like
import csv with data from source AD
For each entry check to see if there already is a user account in the target AD
If there is do nothing and move on to the next entry
If no user is found in the target AD, then create a new user using new-aduser cmdlet
output to console or log file (not decided yet)
I would especially like to get an idea on how to do step 3 and 4. I am thinking something like if else statement.
Regards

Answer 1

That is what I had originally but because he doesn't want to do anything if they do exist, so I figured rather then doing an if/else, just do an if, but you are correct, it does not work that way.....I tend to mix C# programming and powershell
scripting
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Don't Retire Technet
PowerShell is finicky with -not and ! it is also hard for some people tosee and we don't normally think in negative logic.  A positive assertion is best even when testing for the negative.  It is clearer and avoids fall-through.
¯\_(ツ)_/¯