functional programming - Trying to get higher order functions to work in powershell -

i can't example work

{ $_ + $_ }, { $_ + 1}, {$_ - 1} | % { $_ 1 } 

i want construct list/array/collection/whatever of functions (this part fine), , pipe list code block on right, applies each of functions argument 1 , returns array results (namely; 2,2,0). i've tried using getnewclosure() method, & operator, nothing's worked far.

the dollar underbar variable automatic variable populated in scenarios; in case, when there incoming object pipeline. in order give $_ value of 1, appears intent, you'll have pipe number each , execute scriptblock. easiest way pass directly argument % (foreach-object) accepts scriptblock:

ps> { $_ + $_ }, { $_ + 1}, {$_ - 1} | % { 1 | % $_ } 2 2 0 

look @ until makes sense :) if doesn't click, comment here , i'll explain in more detail.

if you're interested in functional tinkering in powershell, might enjoy function wrote partial application:

http://www.nivot.org/blog/post/2010/03/11/powershell20partialapplicationoffunctionsandcmdlets

it's bit unwieldy, still possible.