Passing enum values to a function in PowerShell

To avoid the error put the enum value in parenthesis:

PS > IsItFriday ([System.DayOfWeek]::Monday)  
no

PS > IsItFriday ([System.DayOfWeek]::Friday)  
yes

It's a little bit unexpected - you need to wrap it in parenthesis so that the value is evaluated:

> IsItFriday ([System.DayOfWeek]::Monday)

also it is possible to pass only strings like this:

> IsItFriday Monday
no
> IsItFriday Friday
yes

PowerShell will convert it to the enum type. Handy, isn't it :)

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