PowerShell filter vs. function
- by Marcel Janus
I'm reading currently the Windows PowerShell 3.0 Step by Step book to get some more insights to PowerShell.
On page 201 the author demonstrates that a filter is faster than the function with the same functionally.
This script takes 2.6 seconds on his computer:
MeasureaddOneFilter.ps1
Filter AddOne
{
"add one filter"
$_ + 1
}
and this one 4.6 seconds
MeasureaddOneFunction.ps1
Function AddOne
{
"Add One Function"
While ($input.moveNext())
{
$input.current + 1
}
}
If I run this code is get the exact opposite of his result:
.\MeasureAddOneFilter.ps1
Days : 0
Hours : 0
Minutes : 0
Seconds : 0
Milliseconds : 226
Ticks : 2266171
TotalDays : 2,62288310185185E-06
TotalHours : 6,29491944444444E-05
TotalMinutes : 0,00377695166666667
TotalSeconds : 0,2266171
TotalMilliseconds : 226,6171
.\MeasureAddOneFunction.ps1
Days : 0
Hours : 0
Minutes : 0
Seconds : 0
Milliseconds : 93
Ticks : 933649
TotalDays : 1,08061226851852E-06
TotalHours : 2,59346944444444E-05
TotalMinutes : 0,00155608166666667
TotalSeconds : 0,0933649
TotalMilliseconds : 93,3649
Can someone explain this to me?
