How to Select the Values of One Property on All Objects of an Array in PowerShell

1. Use %{$_.Property} to Select the Values of One Property on All Objects of an Array in PowerShell
2. Use Select-Object to Select the Values of One Property on All Objects of an Array in PowerShell
3. Use $array.Property to Select the Values of One Property on All Objects of an Array in PowerShell
4. Use foreach Statement to Select the Values of One Property on All Objects of an Array in PowerShell

Arrays are the collection of values or objects. Most programming languages have arrays as the fundamental feature. An array is simply a data structure that contains a group of multiple items. An item can be an integer, a string, an object, or an array itself. A single array can include any combination of these items. Each item is stored in an index, always starting from 0. The first item of an array is stored in the index 0, the second item in 1, the third item in 2, and so on.

You can create an array in PowerShell using @().

$data = @()

The above command creates an empty array because we have not given any values.

Here is an example of creating an array $data containing objects in the Name and Age property.

$data = @(
    [pscustomobject]@{Name = 'James'; Age = '21' }
    [pscustomobject]@{Name = 'David'; Age = '30' }
)

We have assigned different values to the Name and Age property. This tutorial will teach you to select the values of one property on all objects of an array in PowerShell.

Use %{$_.Property} to Select the Values of One Property on All Objects of an Array in PowerShell

This is one of the easy method to select the values of one property on all objects of an array in PowerShell.

$select = @($data | % { $_.Name })

$select

Output:

James
David

Or, you can use only %Name like this:

$data | % Name

Output:

James
David

Use Select-Object to Select the Values of One Property on All Objects of an Array in PowerShell

The Select-Object cmdlet selects specified properties of an object or set of objects. It helps select unique objects, a specified number of objects, or objects in a specified position in an array. Thus, you can use Select-Object to select the values of one property on all objects of an array in PowerShell.

$data | Select-Object -ExpandProperty Name

Output:

James
David

Use $array.Property to Select the Values of One Property on All Objects of an Array in PowerShell

This is the simplest method to select the values of one property on all objects of an array in PowerShell.

$data.Age

Output:

21
30

Use foreach Statement to Select the Values of One Property on All Objects of an Array in PowerShell

The ForEach statement is also known as the foreach loop. It is used to traverse all the items in a collection of items. It is a language command used for looping through a series of values in an array or a collection of objects. You can run one or more commands against each item in an array within a ForEach loop.

$data.foreach('Age')

Output:

21
30

Or, you can run the command like this.

$data.foreach({ $_.Age })

Output:

21
30

Alternatively, you can also use the below foreach command to select the values of one property on all objects of an array in PowerShell.

foreach ($object in $data) { $object.Age }

Output:

21
30