Error in PowerShell while using arrays

Question

While I am trying to assign a value to the specific index of an array it is showing the Errors. PS /home/mifi> $names = @()

PS /home/mifi> $names[1]="abc" Index was outside the bounds of the array. At line:1 char:1 + $names[1]="abc" + ~~~~~~~~~~~~~~~ + CategoryInfo : OperationStopped: (:) [], IndexOutOfRangeException + FullyQualifiedErrorId : System.IndexOutOfRangeException

pwsh -v
PowerShell v6.0.2

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Do you try the same with clean session? Show $names.GetType().FullName. Also, please, edit tags to match content of your question. — user4003407
– user4003407, Commented Jun 7, 2018 at 6:57

Martin Brandl · Accepted Answer · 2018-06-07 06:36:18Z

1

Thats because you have to initialize the array first. If you know the size of the array you can do it like this:

$arraySize = 10
$names= 1..$arraySize | foreach { $null }

Consider using a hashtable:

$names = @{}
$names[1] = "abc"

answered Jun 7, 2018 at 6:36

Martin Brandl

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5 Comments

user4003407 Over a year ago

Your $names will not be array, when $arraySize is 1. Also with $arraySize equals to 0 it will create array with 2 elements.

Martin Brandl Over a year ago

@PetSerAl Good point, Keshav should keep that in mind. Depending on his requirements a hashtable would be preferable.

Keshav Maheshwari Over a year ago

@Martin Brandl, It is still showing the error by using your above code and plus I have mentioned the version of the Powershell.

Keshav Maheshwari Over a year ago

@MartinBrandl actually I was using () instead of { } curly braises as it was mention in the older book to use ( ).

Martin Brandl Over a year ago

We need to see your code but using @() will give you an array whereas @{} creates a hashtable. That are two different things

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