Example of a function overload in PowerShell _powershell

In PowerShell, we can use the Function keyword to define functions such as:

Function Get-data {
 Param (
  [int] $data =-1
 ) return
 $data;
}

This function named Get-data receives a parameter $data of type int and returns it directly. Well, I also need a get-data function that receives the string type. The method is strange, at least unlike the traditional C + + languages.

To define an overloaded function in PowerShell, you specify the parameter Set that the parameter belongs to, as follows:

Function Global:get-data {
 Param (
  [Parameter (parametersetname= "Byint", position=0)] [int] $intData,
  [ Parameter (parametersetname= "Byswitch", position=0)] [switch] $boolData,
  [Parameter (parametersetname=) Byarray ", position=0)] [string[]] $arrayData
 )
 write-host $PsCmdlet. Parametersetname
}

It is not difficult to find that parametersetname specifies that each parameter belongs to the parameterset,position indicating that this is an anonymous parameter. And $pscmdlet.parametersetname represents the parameter Set that is currently in use. The use cases are as follows:

PS > Get-data 1
byint
PS > Get-data "a"
Byarray
ps > Get-data-booldata
byswitch

For more information on the PowerShell function parameters, see the relevant introduction on TechNet, or run the command in the PowerShell console: Help About_functions_advanced_parameters