$array = ("123","456"),("abc","xyz")22
$array[0][1]
# = 456

$array2 = ("12a", "45b")
$array2[0][1]
# = 2 

$array3 = @()
$array3 = "000"
$array3.count
# = 1 

找出兩個陣列元素的差異

$newarray = "1","2","3"
$curenarray = "1","2","4"

$labarray = Compare-Object -ReferenceObject $newarray -DifferenceObject $curenarray

PS C:\Users\jason.SB> $labarray

InputObject SideIndicator
----------- -------------
4           =>           
3           <=      

Find duplicates from a PowerShell array  
$a=@(1,2,3,1,2)

$b=$a | select –unique

Remove duplicates from a PowerShell array  

$a = @(1,2,3,4,5,5,6,7,8,9,0,0) $a = $a | select -uniq