In the previous tip we illustrated how the new "enum" keyword works in PowerShell 5.0 to set the values that are assignable to a parameter. This has two backdraws: it works in PowerShell 5.0 only, and the enum needs to be declared before you can run the function.
If all you want is limiting choices, you can use a ValidateSet attribute instead. It is supported in older PowerShell versions and part of the function code:
#requires -Version 2
"You chose $City"
ValidateSets provide smart IntelliSense in PowerShell ISE, just like enumerations do.
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