PowerShell Strongly Encouraged Development Guidelines


Parameters That Take True and False
If your parameter takes only true and false, define the parameter as type SwitchParameter. A switch parameter is treated as true when it is specified in a command. If the parameter is not included in a command, Windows PowerShell considers the value of the parameter to be false. Do not define Boolean parameters.
If your parameter needs to differentiate between 3 values: $true, $false and “unspecified”, then define a parameter of type Nullable. The need for a 3rd, “unspecified” value typically occurs when the cmdlet can modify a Boolean property of an object. In this case “unspecified” means to not change the current value of the property.

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