This function was written by Simon Wåhlin (@SimonWahlin) as an entry to the contest "Windows PowerShell TFM Book Contest and Giveaway" by Mike Robbins. Contest details can be found here:http://mikefrobbins.com/2015/09/23/windows-powershell-tfm-book-contest-and-giveaway/

ConvertTo-SWPascalCase.ps1

<#
.Synopsis
   Change first letter of each word in a string to uppercase and all other letters to lowercase.
.DESCRIPTION
   PascalCase is the notation where the first letter of each word is written in UPPERCASE and the
   rest of the letters are written in lowercase. Usually PascalCase does not contain spaces but
   this function uses any whitespace char to determine the beginning of a new word.
.INPUTS
   Takes one or many strings as input.
.OUTPUTS
   Outputs strings formated with only first letter in each work in UPPERCASE
.EXAMPLE
   'ThE wINDOWS PowerShell TFM book CONTEST aNd GiVeAwAy' | ConvertTo-SWPascalCase

   The Windows Powershell Tfm Book Contest And Giveaway
.EXAMPLE
   ConvertTo-SWPascalCase -InputString 'ThE wINDOWS PowerShell TFM book CONTEST aNd GiVeAwAy'

   The Windows Powershell Tfm Book Contest And Giveaway
.NOTES
   This function was written by Simon Wåhlin (@SimonWahlin) as an entry to the contest "Windows PowerShell TFM 
   Book Contest and Giveaway" by Mike Robbins.

   Contest details can be found here:
   http://mikefrobbins.com/2015/09/23/windows-powershell-tfm-book-contest-and-giveaway/
#>
function ConvertTo-SWPascalCase
{
    [CmdletBinding(ConfirmImpact = 'None')]
    [OutputType([string])]
    Param
    (
        # Input string that will be converted to PascalCase
        [Parameter(Mandatory=$true,
                   ValueFromPipeline=$true,
                   Position=0)]
        [ValidateNotNullOrEmpty()]
        [String[]]
        $InputString
    )
    Begin
    {
        $NewStringBuilder = New-Object -TypeName System.Text.StringBuilder
    }
    Process
    {
        Foreach($String in $InputString)
        {
            [System.Void]$NewStringBuilder.Clear()

            # First char should alwayw be UpperCase
            # non letter chars won't be effected
            if($String[0])
            {
                [System.Void]$NewStringBuilder.Append($String[0].ToString().ToUpper())
            }

            # Loop through rest of string
            for($i=1;$i-lt$String.Length;$i++)
            {
                if($String[($i-1)] -match '\S')
                {
                    # Char follows a non-whitespace char, not beginning of word
                    [System.Void]$NewStringBuilder.Append($String[$i].ToString().ToLower())
                }
                else
                {
                    # Char follows a whitespace char, begginning of word
                    [System.Void]$NewStringBuilder.Append($String[$i].ToString().ToUpper())
                }
            }
            
            Write-Output -InputObject $NewStringBuilder.ToString()
        }
    }
}