Example1:
Note 2: The comma is also used so separate items in an array {0,-30}
Example2:
To create an array, we create a variable and assign the array. Arrays are noted by the “@” symbol. Let’s take the discussion above and use an array to connect to multiple remote computers: $strComputers = @(“Server1″, “Server2″, “Server3″)
So, which one is correct or what is the difference ?
Example 2 uses the array cast syntax which allows a single element, for example, to be treated as an array:
$myList = @("Hello")
Essentially, it allows anything between the parenthesis to be treated as an array including the output from other commands:
$myArray = @(Get-Process Excel)
Alternatively you can just create an array by specifying a comma separated list:
$myArray = "hello", "world", "again"
(The curly brackets are not needed)
@() is referred to as an array subexpression - Windows PowerShell in Action pg 119. :-). The second form above 'hello','world','again' is the "canonical" way to create an array. Array subexpression is typically used to ensure that the result of some expression is an array - either an empty, single element or multiple element array.You can also attain a single element array by prepending the , operator to a single value:
[PS] C:\>$a = ,"Hello World"
[PS] C:\>$a.gettype()
IsPublic IsSerial Name BaseType
-------- -------- ---- --------
True True Object[] System.Array
[PS] C:\>$a.count
1
New-Object PSObject -Property @{array='a','b','c'}