Adding methods with ScriptMethod in PowerShell - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to add a ScriptMethod named 'Greet' to the object $obj.

PowerShell

$obj.PSObject.Members.Add((New-Object System.Management.Automation.PSMethod('Greet', [1])))

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A{ param() 'Hello!' }

B{ Write-Host 'Hello!' }

C{ return 'Hi' }

D{ 'Hello World' }

Attempts:

3 left

💡 Hint

Common Mistakes

Using Write-Host inside the script block instead of returning a value.

Not using a script block as the second argument.

Omitting param() in the script block.

The ScriptMethod requires a script block as the second argument. Using { param() 'Hello!' } defines a method that returns 'Hello!'.

2fill in blank

medium

Complete the code to call the 'Greet' method on the object $obj.

PowerShell

$message = $obj.[1]()

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ASayHello

BGreet

CHello

DSpeak

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different method name than the one added.

Forgetting the parentheses to call the method.

The method added was named 'Greet', so calling $obj.Greet() executes it.

3fill in blank

hard

Fix the error in adding a ScriptMethod that returns the object's name property.

PowerShell

$obj.PSObject.Members.Add((New-Object System.Management.Automation.PSMethod('GetName', [1])))

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A{ param() $Name }

B{ return $obj.Name }

C{ param() return $this.Name }

D{ $this.Name }

Attempts:

3 left

💡 Hint

Common Mistakes

Using $obj inside the script block which is not defined there.

Omitting param() causing errors.

Not returning the value explicitly.

Inside a ScriptMethod, $this refers to the object. Using param() and return ensures the method returns the Name property.

4fill in blank

hard

Fill the blank to add a ScriptMethod 'AddNumbers' that takes two parameters and returns their sum.

PowerShell

$obj.PSObject.Members.Add((New-Object System.Management.Automation.PSMethod('AddNumbers', [1])))

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Areturn $a + $b

B{ $a + $b }

C$a + $b

D{ param($a, $b) $a + $b }

Attempts:

3 left

💡 Hint

Common Mistakes

Not defining parameters in the script block.

Omitting the script block syntax {}.

Using incorrect syntax for the script block.

The ScriptMethod needs a script block with parameters $a and $b. { param($a, $b) $a + $b } defines the method that implicitly returns their sum.

5fill in blank

hard

Fill all three blanks to create an object $obj with a ScriptMethod 'Describe' that returns a string with the object's Name and Age.

PowerShell

$obj = New-Object PSObject -Property @{ Name = 'Alice'; Age = 30 }

$scriptBlock = [1]

$obj.PSObject.Members.Add((New-Object System.Management.Automation.PSMethod('Describe', $scriptBlock)))

$result = $obj.[2]()

Write-Output [3]

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A{ param() "Name: $($this.Name), Age: $($this.Age)" }

BDescribe

C$result

DDescribe()

Attempts:

3 left

💡 Hint

Common Mistakes

Not using $this to access properties inside the script block.

Calling the method incorrectly without parentheses.

Trying to output the method name instead of the result variable.

The script block returns a formatted string using $this to access properties. The method 'Describe' is called, and its result stored in $result, which is output.