How do I check for empty values in an hashtable, and list the item name as well ?
I could do if ($Vars.ContainsValue($null)) but this does not get me what item that has a $null value
$Vars = @{
1 = "CustomerID";
2 = "DepartmentID";
3 = "Environment";
4 = "JoinDomain";
5 = ""
}
if I do a foreach ($var in $vars) I get the whole hashtable?
First of all this is not an array, because those are written as @('element1', 'element2'). This concerns a HashTable which is indicated as @{} and is enumerated by the GetEnumerator() method.
After that method it's simply a matter of filtering out what you need with the key and/or the value property.
$Vars = @{
1 = "CustomerID";
2 = "DepartmentID";
3 = "Environment";
4 = "JoinDomain";
5 = ""
}
$VerbosePreference = 'Continue'
$Vars.GetEnumerator() | Where-Object {
-not $_.Value
} | ForEach-Object {
Write-Verbose "The key '$($_.Key)' has no value"
# Other code for handling the key with no value
}
-not $_.Value would also exclude other values, such as 0, $false, or an empty array. Also, arrays are best written as 'element1', 'element2' - the @(...) is not only unnecessary, it is actually less efficient in PowerShell 5.0 and below (though it won't matter in practice). @(...) is useful for constructing an empty array or a single-element array, though (the latter can also be constructed as , <elem>).