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PowerShell: filter

A filter is a function that just has a process block.

The following two command are equivalent:

filter twice {
    2 * $_
}

function times_two {
    param(
        [parameter(mandatory, valueFromPipeline)]
        [int] $num
    )

    process {
        2 * $num
    }
}

These commands can be invoked in a pipeline like so:

7,21,48 | twice
8,24,11 | times_two

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