Remove empty row from array - arrays

Question

I try to remove empty lines or values in an array, for example if the output of $DBLevel is empty, the hole line should be removed. Is there a easy way to to this?
thanks
$vmname= "srvsql009"
$DBType = "sql"
$DBLevel = ""
$style = "blue"
$myCol = #()
$x = "" | Select 'Name','DB-Type','DB-Level','Style'
$x.Name = $vmname
$x.'DB-Type' = $DBType
$x.'DB-Level' = $DBLevel
$x.'Style' = $style
$myCol += $x
$myCol
IsPublic IsSerial Name BaseType
True True Object[] System.Array

Answer 1

Imagine you had results like this in your $myCol variable.
PS> $myCol
Name DB-Type DB-Level Style
---- ------- -------- -----
srvsql009 sql blue
SQLSRV200 cosmos ALPHA RED
You can filter items in an array using the Where-Object command, like this:
PS> $myCol | Where DB-Level -ne ""
Name DB-Type DB-Level Style
---- ------- -------- -----
SQLSRV200 cosmos ALPHA RED
PowerShell comparison operators are different from most every other programming language, meaning you can't use == to compare equals, or <= for less than or equal to operations.
To learn more about the comparison operators, check out this link.

Answer 2

Continuing from my comment,
Removing elements from a simple array (Object[]) is both time and memory consuming because an array is of fixed length and when you remove an element, the whole array needs to be rebuilt in memory.
If you have a collection you need to be able to remove items from, better make use of a [System.Collections.Generic.List[object]]
Example collection (following your syntax)
$vmname = "srvsql009"
$DBType = "sql"
$DBLevel = 120
$style = "blue"
$list = [System.Collections.Generic.List[object]]::new()
for ($i = 0; $i -lt 5; $i++) {
$x = "" | Select 'Name','DB-Type','DB-Level','Style'
$x.Name = 'srvsql{0:D3}' -f ([int]$vmname.Substring(6) + $i) # for demo, increment the number
$x.'DB-Type' = $DBType
$x.'DB-Level' = if ($i -eq 3) {$null} else {$DBLevel + $i} # for demo add an object with empty 'DB-Level'
$x.'Style' = $style
# add this object to the list
$list.Add($x)
}
$list now contains
Name DB-Type DB-Level Style
---- ------- -------- -----
srvsql009 sql 120 blue
srvsql010 sql 121 blue
srvsql011 sql 122 blue
srvsql012 sql 123 blue
srvsql013 sql 124 blue
Now, if you want to remove one of the items in this list, you can do that using its index:
$list.RemoveAt(2) # removes item 'srvsql011'
Result:
Name DB-Type DB-Level Style
---- ------- -------- -----
srvsql009 sql 120 blue
srvsql010 sql 121 blue
srvsql012 sql blue
srvsql013 sql 124 blue
Or remove by determining the object to delete:
$x = $list | Where-Object { !$_.'DB-Level' }
$list.Remove($x)
Result:
Name DB-Type DB-Level Style
---- ------- -------- -----
srvsql009 sql 120 blue
srvsql010 sql 121 blue
srvsql011 sql 122 blue
srvsql013 sql 124 blue