Checking For Switch Existance

Tags: powershell

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To check whether a parameter was either passed in by the caller or not, inspect the $PSBoundParameters automatic variable:

if($PSBoundParameters.ContainsKey('AddHash')) {
    # switch parameter was explicitly passed by the caller
    # grab its value
    $requestparams.Code = $AddHash.IsPresent
}
else {
    # parameter was absent from the invocation, don't add it to the request
}

---

If you have multiple switch parameters that you want to pass through, iterate over the entries in $PSBoundParameters and test the type of each value:

param(
  [switch]$AddHash,
  [switch]$AddOtherStuff,
  [switch]$Yolo
)

$requestParams = @{ header = 'value' }

$PSBoundParameters.GetEnumerator() |ForEach-Object {
  $value = $_.Value
  if($value -is [switch]){
    $value = $value.IsPresent
  }

  $requestParams[$_.Key] = $value
}

---

Sources:

• https://stackoverflow.com/questions/56809557/how-to-check-if-a-powershell-switch-parameter-is-absent-or-false