String interpolation (double quotes) in PowerShell - Practice Problems & Coding Challenges

Challenge - 5 Problems

💻 Command Output

intermediate

What is the output of this PowerShell code with string interpolation?

Consider the following PowerShell script. What will it output?

PowerShell

$name = "Alice"
$age = 30
Write-Output "My name is $name and I am $age years old."

A My name is $name and I am $age years old.

B My name is Alice and I am 30 years old.

C My name is and I am years old.

D My name is $($name) and I am $($age) years old.

💡 Hint

In PowerShell, variables inside double quotes are replaced by their values.

PowerShell replaces variables inside double quotes with their values, so $name and $age are replaced by 'Alice' and '30' respectively.

💻 Command Output

intermediate

What does this PowerShell code output when using nested expressions in double quotes?

Look at this script and choose the correct output:

PowerShell

$count = 5
Write-Output "There are $($count + 3) items."

A There are 8 items.

B There are $count + 3 items.

C There are 53 items.

D There are $($count + 3) items.

💡 Hint

The $() syntax evaluates the expression inside the parentheses.

The expression $($count + 3) calculates 5 + 3 = 8, so the output is 'There are 8 items.'

💻 Command Output

advanced

What is the output of this PowerShell string interpolation with a file path?

What will this script output?

PowerShell

$path = "C:\Program Files\App"
Write-Output "The path is: $path"

A The path is: C:\Program Files\App

B The path is: $path

C The path is: C:Program FilesApp

D ppAseliF margorP:C :si htap ehT

💡 Hint

Backslashes are literal characters in PowerShell double-quoted strings.

PowerShell interpolates $path, and backslashes are literal in double-quoted strings, so the path outputs with single backslashes.

🚀 Application

advanced

How many items are in the array after this PowerShell script runs?

Given this script, how many items does $results contain?

PowerShell

$results = @()
for ($i = 1; $i -le 3; $i++) {
  $results += "Item $i"
}
$results

A 0

B 1

C 3

D 4

💡 Hint

Each loop adds one string to the array.

The loop runs 3 times, each time adding one item, so $results has 3 items.

🧠 Conceptual

expert

What error does this PowerShell script raise?

What error will this script produce when run?

PowerShell

$value = 10
Write-Output "Result: $value + 5"

A Syntax error: Unexpected token '+'

B No error, outputs: Result: 15

C Runtime error: Invalid expression

D No error, outputs: Result: 10 + 5

💡 Hint

Check how PowerShell treats expressions inside double quotes without $()

PowerShell does not evaluate '+ 5' as an expression inside double quotes unless wrapped in $(), so it outputs the string literally.