# PowerShell 2.0 version of Foreach-Object Clear-host $Prog
=Get-ChildItem 'C:\program files\*.*' -recurse Measure-Command
{$Prog | Foreach-Object {$_.name}}
Result Check for yourself, but assume it takes 100
Milliseconds. I am willing to wager the foreach statement in the
second example below will
be 10 times quicker.
My result 170 ms.
Incidentally, you could use this alias substitution: % {$_.name}
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The whole rationale of
scripting is speed up manual operations. Thus, one of the key elements
is looping through a set of instructions while applying a script block to
each item.
PowerShell 3.0 loops have simpler syntax compared with versions 1 and 2.
As a result beginners can create loops more easily, yet old-timers can
reiterate using the same constructions they used in PowerShell 1.0.
Recap of
PowerShell's Foreach Loop
Let us examine the PowerShell 2.0 loop syntax:
Foreach ($item in $collection-array) {command_block}.
Foreach is the PowerShell instruction to cycle or repeat; it feeds on an
array of ($items in $collection-array) then you need a {Block statement
payload}.
One more tiny, but crucial, component of the PowerShell foreach loop is
'in'.
Simple PowerShell Foreach
# PowerShell Foreach Example
Clear-Host foreach ($number in 1..10 ) { $number *
25}
In PowerShell 3.0 the Where-Object and Foreach-Object have made a set
of {Curly} brackets optional. The idea is to make the scripts easier
to write for beginners. However, you will notice many old-times
still use the version 2.0 fuller syntax.
If you like this page then please share it with your friends
Please email me if you have a better example script. Also please report any factual mistakes, grammatical errors or broken links, I will be happy to correct the fault.
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