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加速数组操作(Array)

Measure-Command {  $ar = @()  for ($x=0; $x -lt 10000; $x++)  {    $ar += $x    }}
执行结果:3.301s


Measure-Command {  $ar = New-Object -TypeName System.Collections.ArrayList  for ($x=0; $x -lt 10000; $x++)  {    $ar.Add($x)  }}
执行结果:0.047s

From:http://powershell.com/cs/blogs/tips/archive/2014/06/23/speeding-up-arrays.aspx