PowerShell increment an array of type System.Object

Question

Me and PowerShell arrays are having some difficulties today and I'm hoping someone can lend me a hand.

I'm looking to run PowerShell's Switch command to alter this code block, which will run on Monday:

for ($i = 1; $i -le 7; $i++)
{
 $d = ((Get-Date).AddDays($i))
 $d2 = ($d.ToString("M/dd/yyyy") + " " + "1:00 am".ToUpper())
 $d3 = ($d.ToString("yyyy-MM-dd"))
 $d4 = (($d).DayOfWeek).ToString("").ToUpper()
My-Function -date $d2 -day $d3 -dayofweek $d4
}

That code works as expected, however the difficulties come in when I'm trying to adjust things, as seen below:

$i=@(-1,0,1,2,3,4,5)
for ($i -le 7; $i++){
 $d = ((Get-Date).AddDays($i))
 $d2 = ($d.ToString("M/dd/yyyy") + " " + "1:00 am".ToUpper())
 $d3 = ($d.ToString("yyyy-MM-dd"))
 $d4 = (($d).DayOfWeek).ToString("").ToUpper()
}

But that code returns the following error text, also trying [int]$i=@(-1,0,1,2,3,4,5) also doesn't work. That returns Cannot convert the "System.Object[]" value of type "System.Object[]" to type "System.Int32".At line:1 char:1

The '++' operator works only on numbers. The operand is a 'System.Object[]'.At line:2 char:16
+ for ($i -le 7; $i++){
+                ~~~~
+ CategoryInfo          : InvalidOperation: (:) [], RuntimeException
+ FullyQualifiedErrorId : OperatorRequiresNumber

user4317867 · Accepted Answer · 2015-01-29 07:23:13Z

3

That error is correct. $i is an array and you're trying to invoke the ++ operator on it and that is not supported. I think you want this

$array = -1,0,1,2,3,4,5
foreach ($i in $array) {
    $d = (Get-Date).AddDays($i)
    $d2 = $d.ToString("M/dd/yyyy") + " 1:00 AM"
    $d3 = $d.ToString("yyyy-MM-dd")
    $d4 = $d.DayOfWeek.ToString().ToUpper()
}

edited Jan 29, 2015 at 7:23

user4317867

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answered Jan 29, 2015 at 2:21

Keith Hill

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1 Comment

user4317867 Over a year ago

Yup yup, after much begging and yelling at PowerShell, I recalled foreach and now I know you can run foreach against a collection of numbers! Thanks @Keith

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