Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Update PossibleIncorrectComparisonWithNull.md #1226

Merged
merged 1 commit into from
May 16, 2019
Merged

Update PossibleIncorrectComparisonWithNull.md #1226

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
2 changes: 1 addition & 1 deletion RuleDocumentation/PossibleIncorrectComparisonWithNull.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -7,7 +7,7 @@
To ensure that PowerShell performs comparisons correctly, the `$null` element should be on the left side of the operator.

There are a number of reasons why this should occur:
* `$null` is a scalar. When the input (left side) to an operator is a scalar value, comparison operators return a Boolean value. When the input is a collection of values, the comparison operators return any matching values, or an empty array if there are no matches in the collection. The only way to reliably check if a value is `$null` is to place `$null` on the left side of the operator so that a scalar comparison is perfomed.
* `$null` is a scalar. When the input (left side) to an operator is a scalar value, comparison operators return a Boolean value. When the input is a collection of values, the comparison operators return any matching values, or an empty array if there are no matches in the collection. The only way to reliably check if a value is `$null` is to place `$null` on the left side of the operator so that a scalar comparison is performed.
* PowerShell will perform type casting left to right, resulting in incorrect comparisons when `$null` is cast to other scalar types.

## How
Expand Down