powershell - How to pass custom filter function to Where-Object -

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For the past few hours I am trying to figure out how a script block can be filtered for the function Is the object. I have not received any documents, I should remember something. I looked at "filter script" and "function: script" definitions, but I do not know how it is used and I can not find it anywhere. 

  function test {the ultimate ($ f, $) $ x = $ what? Where $ f $ x} $ mywhat = @ ('aaa,' b ',' abb ',' bac ') Filter Script: myfilter {$ _- like' a * '} Test- $ mywhat -xx $ myfilter < / Code>  
 Can someone point me in the right direction?   
 
 
 It is not clear what you are asking here.  
 A filter is a function and not a script block  where the object takes the script as the input  if you want to specify the position inside a function using parameters , Then you can use script block-parameter.  
  function test {param ([scriptblock] $ f, $ what) $ x = $ what | Where $ f $ x} $ myfilter = {$ _- like 'a *'} test- what $ mywhat -f $ myfilter # or combine them- what $ mywhat -f {$ _- like 'a *'} < / Code>  
 If you want to use only one filter, then how to do it:  
  Filter script: myfilter {if ($ _-like 'a * ') {$ _}} $ Mywhat | Myfilter   
 this  $ mywhat | Will be equal to {$ _-like 'a *'}

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