Parameters with default value not in PsBoundParameters?

Question

General code

Consider this code:

PS> function Test { param($p='default value') $PsBoundParameters }
PS> Test 'some value'
Key                                                               Value
---                                                               -----
p                                                                 some value
PS> Test
# nothing

I would expect that $PsBoundParameters would contain record for $p variable on both cases. Is that correct behaviour?

Question

I'd like to use splatting that would work like this for a lot of functions:

function SomeFuncWithManyRequiredParams {
  param(
    [Parameter(Mandatory=$true)][string]$p1,
    [Parameter(Mandatory=$true)][string]$p2,
    [Parameter(Mandatory=$true)][string]$p3,
  ...other parameters
  )
  ...
}
function SimplifiedFuncWithDefaultValues {
  param(
    [Parameter(Mandatory=$false)][string]$p1='default for p1',
    [Parameter(Mandatory=$false)][string]$p2='default for p2',
    [Parameter(Mandatory=$false)][string]$p3='default for p3',
  ...other parameters
  )
  SomeFuncWithManyRequiredParams @PsBoundParameters
}

I don't want to call SomeFuncWithManyRequiredParams with all the params enumerated:

  SomeFuncWithManyRequiredParams -p1 $p1 -p2 $p2 -p3 $p3 ...

Is it possible?

Answer 1

It depends on how you define "bound" I guess i.e. is the value bound from a user supplied value or a default value supplied by the function? Honestly, it doesn't surprise me that it behaves the way it does as I view "bound" to mean the former - bound from user input. Anyway, you can solve this by patching the $PSBoundParameters variable e.g.:

function SimplifiedFuncWithDefaultValues { 
  param( 
    [Parameter(Mandatory=$false)][string]$p1='default for p1', 
    [Parameter(Mandatory=$false)][string]$p2='default for p2', 
    [Parameter(Mandatory=$false)][string]$p3='default for p3', 
  ...other parameters 
  ) 
  if (!$PSBoundParameters.ContainsKey(p1))
  {
    $PSBoundParameters.p1 = 'default for p1'
  }
  # rinse and repeat for other default parameters.
  SomeFuncWithManyRequiredParams @PSBoundParameters 
}