How to test for $null array in PowerShell

Question

I\'m using an array variable in PowerShell 2.0. If it does not have a value, it will be $null, which I can test for successfully:

PS C:\\> [array]$foo =          


        

Answer 1

if($foo -eq $null) { "yes" } else { "no" }

help about_comparison_operators 

displays help and includes this text:

All comparison operators except the containment operators (-contains, -notcontains) and type operators (-is, -isnot) return a Boolean value when the input to the operator (the value on the left side of the operator) is a single value (a scalar). When the input is a collection of values, the containment operators and the type operators return any matching values. If there are no matches in a collection, these operators do not return anything. The containment operators and type operators always return a Boolean value.