How to pass a script block as parameter and execute multiple times? - powershell

Question

I wish to pass "Write-Host mm" as script block to function "f", and I hope "f" will execute it 10 times, so I tried:
function f([ScriptBlock]$s)
{
1..10|$s
}
f(Write-Host mm)
Unfortunately, powershell gives error:
At C:\Users\engineer\Documents\Untitled1.ps1:3 char:11
+ 1..10|$s
+ ~~
Expressions are only allowed as the first element of a pipeline.
+ CategoryInfo : ParserError: (:) [], ParentContainsErrorRecordException
+ FullyQualifiedErrorId : ExpressionsMustBeFirstInPipeline
How to correct my script?
Thanks for Jason's first answer, but seems doesn't work:
Thanks, but seems this doesn't work, I've got PS 4.0 and
function f([ScriptBlock]$s)
{
1..10 | & $s
}
f { Write-Host mm }
Execute this script and it prints out:
Thanks, but seems this doesn't work, I've got PS 4.0 and
d:\ > function f([ScriptBlock]$s)
{
1..10 | & $s
}
f { Write-Host mm }
mm
This is strange! A script prints out itself! I've got PS4.0 and running ISE.
Why is that?

Answer 1

You are trying to execute your scriptblock 10 times, but instead you try to pipe in an array from 1 to 10. You should pipe that array to foreach-object instead.
function f([ScriptBlock]$s)
{
1..10 | % {& $s}
# % is an alias for Foreach-Object
}
f { Write-Host mm }

Answer 2

You need to use the invocation operator &. Also, script blocks are enclosed in curly braces, so your example would be:
function f([ScriptBlock]$s)
{
1..10 | & $s
}
f { Write-Host mm }
Note that you don't call PowerShell functions like you would a C# method - you don't use parentheses around the arguments, you call PowerShell functions like commands, with spaces between arguments.