Private/Metrics/Get-SwitchCombination.ps1
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Function Get-SwitchCombination { <# .SYNOPSIS Calculates the number of additional code paths, given the number of Switch clauses which don't contain a Break statement. .DESCRIPTION Calculates the number of additional code paths, given the number of Switch clauses which don't contain a Break statement. The formula is 2 to the power of the input integer. This is based on : https://math.stackexchange.com/questions/161565/what-is-the-total-number-of-combinations-of-5-items-together-when-there-are-no-d But we don't substract 1, because the case where none of the Switch clause apply is a possible code path which should be included. .PARAMETER Integer The number of clauses in a given Switch statement which don't contain a Break statement. .EXAMPLE PS C:\> Get-SwitchCombination -Integer 3 Calculates the number of additional code paths due to 3 clauses which don't contain a Break statement in a Switch statement. .OUTPUTS System.Int32 .NOTES https://math.stackexchange.com/a/161568 #> [CmdletBinding()] [OutputType([System.Int32])] Param( [Parameter(Position=0, Mandatory)] [System.Int32]$Integer ) $CombinationsTotal = If ( $Integer -le 1 ) { $Integer } Else { [System.Math]::Pow(2,$Integer) } If ( $CombinationsTotal -ge [System.Int32]::MaxValue ) { return [System.Int32]::MaxValue } return ($CombinationsTotal -as [System.Int32]) } |