powershell - Why does a function that calls another with the same parameter name clobber its own parameter with that name? -


consider following code:

function f2 {     [cmdletbinding()]     param( $e4da2f9 )     process{} } function f1 {     [cmdletbinding()]     param     (         $e4da2f9     )     process     {         $e4da2f9           $command = 'f2'          $splat = @{             e4da2f9 = 'value passed f2'         }          # following line clobbers function's $e4da2f9...         . $command @splat | out-null          # ...but line not         # f2 @splat | out-null          $e4da2f9     } }  f1 'value passed f1'

running it, surprisingly yields following:

value passed f1 value passed f2

if comment out . $command ... , uncomment f2 @splat ... yields expected result:

value passed f1 value passed f1
  1. why happen?
  2. is there fundamental difference between calling function plainly , calling using . $functionname?
  3. how call function recursively using if have name in variable?

it's because dot-sourced function rather running (&). said run f2 in scope of f1.

replacing offending line this:

 & $command @splat | out-null

makes work want.


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