How to Negate powershell conditions

While developing some new functions for one of my Powershell modules today, I faced the problem where I had to negate one of my functions.

To be more specific, I have a function that returns $True if the Powershell session/user has administrator privileges. I then had to display an error cause the function had to be able to access system files.

The solution is very simple. Lets say we have the following statement:

if (Test-Path C:\Scripts) {
    Write-Host "Path exists."
} 
and we want to negate it.

The only thing we have to do is enclose the Test-Path check into Not function:
if (-Not (Test-Path C:\Scripts)) {
    Write-Error "Path does not exist!"
} 

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