PowerShell: Array

What is Array

• Array is a list of values.
• The values can be different types.
• Array length is fixed.
• You can add items or join array, but PowerShell creates a new array, each time, and is slow.

Create Array

Array Sub-Expression Operator

$x = @(3, 4, 5)
Write-Host $x

• PowerShell: Array Sub-Expression Operator, Collection to Array

Comma Operator

array can be created by values separated by comma

$x = 3, 4, 5

can be multiple lines:

$x =
"a",
"b",
"c";

🛑 WARNING: if you format array items one per line, the last item must not have comma.

Create a Array of Single Item

To create a array of single item, precede the item by a comma.

$a = ,4

Create Array (Range Operator)

min..max

Creates an array of contiguous integers, from min..max, inclusive.

$a = 3..7
# result 3 4 5 6 7

Create Array of All 0

# create a array of 0
$x = [int[]]::new(3)
Write-Host $x
# 0 0 0

length

use method length or its alias count

(3,4,5).length
# 3