CODEWITHSUNDEEP
powershell
Gregory Suvalian
Gregory Suvalian

Reputation: 3832

How do I use $_ inside nested loops?

If I have 2 nested loops, how do I refer to current item in outer loop inside inner loop? Is it possible?

$arrayA = @(1..10)
$arrayB = @(11.20)
$arrayA.ForEach({$_; $arrayb.Where({$_ -eq $_})})

Upvotes: 1

Views: 669

Answers (2)

Maximilian Burszley
Maximilian Burszley

Reputation: 19684

Instead of using the array methods, use the cmdlets:

$arrayA | ForEach-Object -PipelineVariable item {
    $arrayB.Where{$item -eq $_}
}

# shortened
$arrayA | % -pv item { $_; $arrayB.Where{$item -eq $_} }

-PipelineVariable was introduced in v4 (which you have based off your use of array methods ForEach and Where).

Although a better solution:

$arrayA.Where{$_ -in $arrayB}

Upvotes: 3

TobyU
TobyU

Reputation: 3918

Here is a short example of how you can access the current value of the element of the first array within the loop of the second array:

$arrayA = @(1..10)
$arrayB = @(1..10)

$arrayA | foreach {

    $tempA = $_
    $arrayB | foreach {

        "$tempA - $_"
    }
}

Just run the code to get an idea.

Upvotes: 0

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