GetType used in PowerShell difference between variables

Question

What is the difference between variables  a and  b    a    Get-Date  DayOfWeek  b   Get-Date   Select-Object DayOfWeek   I tried to check   a GetType  b GetType  MemberType            Method OverloadDefinitions    type GetType    TypeNameOfValue       System Management Automation PSMethod Value                 type GetType   Name                  GetType IsInstance            True  MemberType            Method OverloadDefinitions    type GetType    TypeNameOfValue       System Management Automation PSMethod Value                 type GetType   Name                  GetType IsInstance            True   But there seems to be no difference although the output of these variables looks different

User · Answer

Select-Object creates a new psobject and copies the properties you requested to it  You can verify this with GetType     PS  gt   a GetType   fullname System DayOfWeek  PS  gt   b GetType   fullname System Management Automation PSCustomObject

User · Answer

First of all  you lack parentheses to call GetType  What you see is the MethodInfo describing the GetType method on  DayOfWeek   To actually call GetType  you should do    a GetType     b GetType      You should see that  a is a  DayOfWeek   and  b is a custom object generated by the Select-Object cmdlet to capture only the DayOfWeek property of a data object  Hence  it s an object with a DayOfWeek property only   C   gt   b DayOfWeek -eq  a True

User · Answer

Select-Object returns a custom PSObject with just the properties specified  Even with a single property  you don t get the ACTUAL variable  it is wrapped inside the PSObject   Instead  do   Get-Date   Select-Object -ExpandProperty DayOfWeek   That will get you the same result as    Get-Date  DayOfWeek   The difference is that if Get-Date returns multiple objects  the pipeline way works better than the parenthetical way as  Get-ChildItem   for example  is an array of items  This has changed in PowerShell v3 and  Get-ChildItem  FullPath works as expected and returns an array of just the full paths

[powershell] GetType used in PowerShell, difference between variables

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