December 2015 Scripting Games Submission, Windos

Windos-ScriptingGames-2015-12.ps1

$list = @"
1 Partridge in a pear tree
2 Turtle Doves
3 French Hens
4 Calling Birds
5 Golden Rings
6 Geese a laying
7 Swans a swimming
8 Maids a milking
9 Ladies dancing
10 Lords a leaping
11 Pipers piping
12 Drummers drumming
"@

# 'Split $list into a collection of entries, as you typed them, and sort the results by length.'

$list.Split("`n") | Sort-Object -Property Length

# As a bonus, see if you can sort the length without the number.

$list.Split("`n") -replace '\d+ ' | Sort-Object -Property Length

# Turn each line into a custom object with a properties for Count and Item.

$list.Split("`n") | ForEach-Object { New-Object -TypeName PSCustomObject -Property @{'Count' = $_.Split(' ')[0]; 'Item' = ($_ -replace '\d+ ')} }

# Using your custom objects, what is the total number of all bird-related items?

# n.b. Have assumed the request was for the sum of bird related items, and not the count of lines referencing birds.
$gifts = $list.Split("`n") | ForEach-Object { New-Object -TypeName PSCustomObject -Property @{'Count' = $_.Split(' ')[0]; 'Item' = ($_ -replace '\d+ ')} }
($gifts | Where-Object -FilterScript {$_.Item -match 'Partridge|Doves|Hens|Birds|Geese|Swans'} | Measure-Object -Sum -Property Count).Sum

# What is the total count of all items?
# n.b. Using PSCustomObjects from previous challenge.

($gifts | Measure-Object -Sum -Property Count).Sum

# Using PowerShell what is the total number of cumulative gifts?

# Recursion! (using PSCustomObjects from previous challenge.
function CountGifts {
    param (
        [int] $sum = 0,
        [int] $index = 0,
        [PSCustomObject[]] $collection
    )

    if ($index -eq $collection.Count ) {
        $sum
    }
    else {
        for ($i = $index; $i -gt -1; $i--) {
            $sum += $collection[$i].Count
        }

        CountGifts -sum $sum -index ($index + 1) -collection $collection
    }
}

CountGifts -collection $gifts