Adding properties to objects in PowerShell - Practice Problems & Coding Challenges

Challenge - 5 Problems

💻 Command Output

intermediate

What is the output after adding a NoteProperty?

Consider this PowerShell code that creates a custom object and adds a NoteProperty. What will be the output when the object is displayed?

PowerShell

$obj = New-Object PSObject
$obj | Add-Member -MemberType NoteProperty -Name 'Color' -Value 'Blue'
$obj

A @{Color=Blue}

B Color : Blue

C PSObject

D Error: Method not found

💡 Hint

Think about how PowerShell displays objects with properties.

When you add a NoteProperty to a PSObject and output the object, PowerShell shows the property name and its value in a list format.

💻 Command Output

intermediate

What happens when you add a ScriptProperty?

Given this code, what will be the output of `$obj.Size`?

PowerShell

$obj = New-Object PSObject
$obj | Add-Member -MemberType ScriptProperty -Name 'Size' -Value { 10 * 2 }
$obj.Size

A 20

B Error: Property not found

C 10 * 2

D ScriptBlock

💡 Hint

ScriptProperty runs the script block when accessed.

A ScriptProperty runs the script block and returns its result when accessed, so `$obj.Size` evaluates to 20.

🔧 Debug

advanced

Why does this code fail to add a property?

This code is intended to add a NoteProperty 'Age' with value 30 to the object. Why does it fail?

PowerShell

$obj = New-Object PSObject
$obj.Add-Member -MemberType NoteProperty -Name 'Age' -Value 30

A New-Object PSObject does not support adding properties.

B The property name 'Age' is reserved and cannot be used.

C Add-Member is not a method of the object; it is a cmdlet and must be called separately.

D The value 30 must be a string, not an integer.

💡 Hint

Check how Add-Member is used in PowerShell.

Add-Member is a cmdlet that takes the object as input; it is not a method of the object instance.

💻 Command Output

advanced

What is the output after adding multiple properties?

What will be the output of this script?

PowerShell

$obj = New-Object PSObject
$obj | Add-Member -MemberType NoteProperty -Name 'Name' -Value 'Alice'
$obj | Add-Member -MemberType NoteProperty -Name 'Age' -Value 28
$obj | Add-Member -MemberType NoteProperty -Name 'Country' -Value 'USA'
$obj | Format-List

A

Name : Alice
Age : 28
Country : USA

B @{Name=Alice; Age=28; Country=USA}

C Alice 28 USA

D Error: Multiple properties not supported

💡 Hint

Format-List shows each property on its own line.

Format-List outputs each property and its value on separate lines in the format 'Name : Value'.

🚀 Application

expert

How to dynamically add properties from a hashtable?

You have a hashtable `$props = @{City='Seattle'; Zip=98101}`. Which script correctly adds these as NoteProperties to a new PSObject `$obj`?

PowerShell

$props = @{City='Seattle'; Zip=98101}
$obj = New-Object PSObject
# Add properties here

A foreach ($key in $props) { $obj.AddMember($key, $props[$key]) }

B $obj | Add-Member -MemberType NoteProperty -Name $props.Keys -Value $props.Values

C Add-Member -InputObject $obj -MemberType NoteProperty -Name $props -Value $props

D foreach ($key in $props.Keys) { $obj | Add-Member -MemberType NoteProperty -Name $key -Value $props[$key] }

💡 Hint

You need to loop through each key-value pair and add them one by one.

Option D loops through each key in the hashtable and adds a NoteProperty with the key as name and value from the hashtable. Other options misuse Add-Member or syntax.