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Add an operator to allow safe checking for property names in Strict Mode #15338
Description
Summary of the new feature/enhancement
Currently Strict Mode is very difficult to use effectively, as there isn't really a good way to safeguard code against errors that may arise from objects not having certain properties. Given how mutable objects can be in powershell, this makes working in strict mode more frustrating than it needs to be.
Proposed technical implementation details (optional)
Currently the only real way to check this is with the somewhat obscure $object.PSObject.Properties.Name -contains $propName -- an operator should be provided that checks whether the property exists in a similar way (can we be more thorough than this? Should we?) and safely returns a null or false so that these expressions are easier to write.
Temporarily borrowing the ?. operator for now (we don't have to use this operator, but at least to me it sort of makes sense here), it would look something like this:
$value = if ($myObj?.Property) {
$myObj.Property
}
else {
$safeDefault
}
# nice and neat if we use null coalescing too
$value = $myObject?.Property ?? $safeDefault
Activity
iRon7 commentedon Jul 25, 2023
With the latest version of
Set-StrictModethere are even two different kind of strict errors here:The object not exists (is
$Null):$ObjectNotExists.Properyand the property not exists:
$MyObject.ProperyNotExistsMeaning that this probably requires also two enhancements:
If the object potentially not exists (is
$Null):$myObject?.Propertyand if the property potentially not exists:
$myObject.Property?Or where potentially both the object and the property might not exist:
$myObject?.Property?microsoft-github-policy-service commentedon Jan 21, 2024
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