PowerShell - leap, raindrops, reverse-string, two-fer

powershell/raindrops/Raindrops.ps1

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+Function Get-Raindrops() {
+    <#
+    .SYNOPSIS
+    Given a number convert it to Pling, Plang, Plong if it has factors of 3, 5 or 7.
+    
+    .DESCRIPTION
+    Convert a number to a string, the contents of which depend on the number's factors.
+
+    - If the number has 3 as a factor, output 'Pling'.
+    - If the number has 5 as a factor, output 'Plang'.
+    - If the number has 7 as a factor, output 'Plong'.
+    - If the number does not have 3, 5, or 7 as a factor, just pass the number's digits straight through.
+    
+    .PARAMETER Rain
+    The number to evaluate
+    
+    .EXAMPLE
+    Get-Raindrops -Rain 35
+
+    This will return PlangPlong as it has factors of 5 and 7
+
+    .EXAMPLE
+    Get-Raindrops -Rain 12121
+
+    This will return 12121 as it does not contain factors of 3, 5 or 7 so the value is passed through.
+    #>
+    [CmdletBinding()]
+    Param(
+        [int]$Rain
+    )
+
+
+    [String] $result = ""
+    if ($Rain % 3 -eq 0) { $result += "Pling" }
+    if ($Rain % 5 -eq 0) { $result += "Plang" }
+    if ($Rain % 7 -eq 0) { $result += "Plong" }
+
+    if ($result.Length -gt 0) { return $result }
+    return $Rain.ToString()
+}