rePS

0.1.0

Exercises/Advanced/adv-foreach-parallel/exercise.psd1

                                @{

    Id           = 'adv-foreach-parallel'

    Title        = 'Parallel processing'

    Topic        = 'Advanced'

    Level        = 3

    Platforms    = @('Windows', 'Linux', 'MacOS')

    Tags         = @('parallel', 'runspaces', 'using-scope')

    FunctionName = 'Invoke-ParallelSquare'

    Author       = 'rePS'

    Prompt       = @'

Write Invoke-ParallelSquare so it squares every number in -Number using

ForEach-Object -Parallel, with at most -ThrottleLimit running at once.

Each item first sleeps -DelayMilliseconds (to simulate slow work).

Output objects with Number and Square properties, in the SAME ORDER as the input,

even though parallel results come back in any order.

    Invoke-ParallelSquare -Number 3, 1, 2 -ThrottleLimit 3

    # Number 3 Square 9, Number 1 Square 1, Number 2 Square 4

'@

    Hints        = @(

        'Parallel scriptblocks run in separate runspaces. Read outer variables with $using:DelayMilliseconds.'

        'Output order is not guaranteed. Pipe indexes (0..($Number.Count - 1)) through it and look up ($using:Number)[$_].'

        'Emit an Index with each result, then Sort-Object Index | Select-Object Number, Square.'

    )

}