Question

I know Ruby has a map! method which do this. In PowerShell currently what I did is:

$new_array = @();
$array | % {
    $new_array += <do something with the currently element $)>;
}
$array = $new_array;

I want to know the best way to do this. Thanks!

Answer 1

Simplest I can think of is

$array | %{ $_ + 1 }

$_ + 1 being the transformation I want.

So you can do:

$new = $array | %{$_ + 1}

or

$array = $array | %{ $_ + 1} 

---

PS:
You can define a map function if you want:

function map ([scriptblock]$script, [array] $a) {

    $a | %{ & $script $_ }

}

map {param($i) $i + 1} 1,2,3

Or write an extension method on System.Array: http://blogs.msdn.com/b/powershell/archive/2008/09/06/hate-add-member-powershell-s-adaptive-type-system.aspx