Pwsh▸ParameterIsBlank▸NewEmployee.ps1

Pwsh▸ParameterIsBlank▸NewEmployee.ps1

function NewUser {
    <#
    .synopsis
        Create a new user with a name. Any "blank" values will fallback with a default value

    .DESCRIPTION
        If you use ValidateIfNotSomething, invalid or missing values throws.
        
        - Sometimes you want the command that always works, with a fallback value
        - $null, empty string to count as blank
        - and treat all 'white-space only' values to like an empty string
        
    tip: You can pass $nulls, empty arrays, ... even objects to String.IsNullOrWhiteSpace. 
      those will be truthy. 
    #>
    param(
        # If parameter is empty or whitespace, use a  default value.
        # ie: ensure it is not "blank"
        [Parameter(Position = 0)]
        [string] $UserName
    )
    [PSCustomObject]@{
        PSTypeName = 'Employee'
        HireDate   = [DateTime]::Now

        Name = if( [String]::IsNullOrWhiteSpace( $UserName ) ) {
                'Default User'
            } else { $UserName }

        ID = New-Guid
    }
}

NewUser
NewUser 'bob'
NewUser -UserName ''
NewUser -UserName $null
NewUser -UserName '  '
NewUser -UserName "`t`n    `n"



# give these a shot
[String]::IsNullOrEmpty( @() )
[String]::IsNullOrEmpty( $null )
[String]::IsNullOrEmpty( '')
[String]::IsNullOrEmpty( ' ' )
[String]::IsNullOrEmpty( "`t`n    `n" )

[String]::IsNullOrWhiteSpace( @() )
[String]::IsNullOrWhiteSpace( $null )
[String]::IsNullOrWhiteSpace( '')
[String]::IsNullOrWhiteSpace( ' ' )
[String]::IsNullOrWhiteSpace( "`t`n    `n" )