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    <p>Neither Square not Wrap will do what you're trying in #'s 5 and 7. Regardless of whether you put an array within a grouping expression () as you do in Square or you use the comma operator as you do in Wrap, when you use these functions in the pipeline their output is unrolled as it is feed to the next pipeline stage one at a time. Similarly in 6 and 8, it doesn't matter that you pipe in multiple objects, both Square and Wrap will feed them out one at a time to your foreach stage.</p> <p>Cases 9 and 10 seem to indicate a bug in PowerShell. Take this modified snippet and try it:</p> <pre><code>"a" | SquareAndWrap | % { # 9. only @() and $() succeed $_.GetType().FullName $_.Length $lhs -f [object[]]$_ $lhs -f [object[]]($_) $lhs -f @($_) $lhs -f $($_) } </code></pre> <p>It works. It also shows that the foreach alreadyd receives an object[] size 2 so <code>$_</code> should work without casting to [object[]] or wrapping in a subexpression or array subexpression. We have seen some V2 bugs related to psobjects not unwrapping correctly and this appears to be another instance of that. If you unwrap the psobject manually it works e.g. <code>$_.psobject.baseobject</code>.</p> <p>I "think" what you are shooting for in Wrap is this:</p> <pre><code>function Wrap2 { Begin {$coll = @();} Process {$coll += $_} End {,$coll} } </code></pre> <p>This will accumulate all pipeline input and then output it as a single array. This will work for case 8 but you still need to cast to [object[]] on the first two uses of the <code>-f</code> operator.</p> <p>BTW the parens in both Square and Wrap and the outer parens in SquareAndWrap are unnecessary. </p>
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    1. POHow *exactly* does the RHS of PowerShell's -f operator work?
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    1. USKeith Hill
    1. USKeith Hill
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    1. COCool. I'll file a Connect bug.
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      1. USRichard Berg
 

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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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