benchmark: calculate sum of odd number with powershell

benchmark.ps1

function benchmark([scriptblock]$Sb, [int]$Repeat, [string]$Way) {
    [double]$tmp = 0
    for ($i = 0; $i -lt $Repeat; $i++) {
        $tmp += (Measure-Command $Sb).TotalMilliSeconds
    }
    [Console]::WriteLine("$Way | $Repeat | {0:0.000}", $($tmp / $Repeat))
}

Write-Host "BenchMark(Method) | Times | Avg(ms)
---- | ---- | ----"
benchmark -Sb { (1..100).Where{ ($_ -band 1) -eq 0 } | Measure -Sum } -Repeat 1000 -Way bitwise
benchmark -Sb { (1..100).Where{ [int]($_ / 2) * 2 -eq $_ } | Measure -Sum } -Repeat 1000 -Way division
benchmark -Sb { (1..100).Where{ $_ % 2 -eq 0 } | Measure -Sum } -Repeat 1000 -Way modulo
benchmark -Sb { (1..100).where{ ($_ -shr 1) -shl 1 -eq $_ } | Measure -Sum } -Repeat 1000 -Way shift

Write-Host ""

Write-Host "Benchmark(Pipeline) | Times | Avg(ms)
---- | ---- | ----"
benchmark -Sb { 1..100 | Where { ($_ -band 1) -eq 0 } | Measure -Sum } -Repeat 1000 -Way bitwise
benchmark -Sb { 1..100 | Where { [int]($_ / 2) * 2 -eq $_ } | Measure -Sum } -Repeat 1000 -Way division
benchmark -Sb { 1..100 | Where { $_ % 2 -eq 0 } | Measure -Sum } -Repeat 1000 -Way modulo
benchmark -Sb { 1..100 | where { ($_ -shr 1) -shl 1 -eq $_ } | Measure -Sum } -Repeat 1000 -Way shift

BenchMark(Method)	Times	Avg(ms)
bitwise	1000	0.542
division	1000	0.521
modulo	1000	0.489
shift	1000	0.520

Benchmark(Pipeline)	Times	Avg(ms)
bitwise	1000	1.353
division	1000	1.486
modulo	1000	1.330
shift	1000	1.359