Loops

Loops may be used to iterate through collections, performing an operation against each element in the collection, or to repeat an operation (or series of operations) until a condition is met.The following loops will be demonstrated in this section:

• foreach
• for
• do
• while

The foreach loop is perhaps the most common of these loops.

foreach loop

The foreach loop executes against each element of a collection using the following notation:

foreach (<element> in <collection>) {
    <statements>
}

For example, the foreach loop may be used to iterate through each of the processes returned by Get-Process:

foreach ($process in Get-Process) {
    Write-Host $process.Name
}

If the collection is empty, the body of the loop will not execute.

ForEach keyword and ForEach alias

PowerShell comes with the alias foreach for the ForEach-Object command. When this alias acts depends on context.If foreach is first in a statement, then the loop keyword is used.

$array = 1..3
foreach...