CODEWITHSUNDEEP
functionpowershellparameters
Riccardo
Riccardo

Reputation: 2216

Powershell conditionally add switch & parameter to function call

I am using a function that has an optional switch, however in a loop, switch and related value may be required or not, depending on a pagination mechanism.

# basic function call
myFunction $someParam 

# function call with pagination switch
myFunction $someParam -NextPageToken $theToken

Ideally this should be used in a more elegant way in a loop:

$theToken = ""
do{
   $result = myFunction $someParam -NextPageToken $theToken # pagination switch should not be used on first call
   $theToken = $result.next_page_token
}while($theToken -ne "")

But the function will throw an error if the switch is used with no value....

Does Powershell support dynamically/conditionally adding the switch & value only if required, so that the function call is used only once in code?

Upvotes: 0

Views: 506

Answers (1)

Mathias R. Jessen
Mathias R. Jessen

Reputation: 174690

Use a hashtable to splat the token:

$params = @{}
do{
   $result = myFunction $someParam @params
   $params = @{ NextPageToken = $result.next_page_token }
}while("" -ne $params['NextPageToken'])

On the first iteration, the splatting table will be empty (ie. no NextPageToken parameter will be passed), but subsequent runs will.

See the about_Splatting help file to learn more about using splatting for conditional parameter arguments

Upvotes: 3

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