Learn PowerShell - 10 Code Examples & CST Typing Practice Test

PowerShell is a cross-platform task automation and configuration management framework, combining a command-line shell, scripting language, and object-based pipeline built on .NET. It is widely used for DevOps, system administration, cloud automation, and enterprise workflows.

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PowerShell Counter and Theme Toggle PowerShell Simple Calculator PowerShell Factorial PowerShell Fibonacci Sequence PowerShell Array Comprehension PowerShell Hashtable Filtering PowerShell Anonymous Functions PowerShell Sum of Array PowerShell Zip Arrays PowerShell String Manipulation

Learn POWERSHELL with Real Code Examples

Updated Nov 19, 2025

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Code Sample Descriptions

PowerShell Counter and Theme Toggle

$count = 0
$isDark = $false

function Update-UI {
    Write-Host "Counter: $count"
    Write-Host "Theme: $(if ($isDark) { 'Dark' } else { 'Light' })"
}

function Increment { $global:count += 1; Update-UI }
function Decrement { $global:count -= 1; Update-UI }
function Reset { $global:count = 0; Update-UI }
function Toggle-Theme { $global:isDark = -not $global:isDark; Update-UI }

# Simulate actions
Update-UI
Increment
Increment
Toggle-Theme
Decrement
Reset

Demonstrates a simple counter with theme toggling using PowerShell variables and console output.

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PowerShell Simple Calculator

function Add($a, $b) { $a + $b }
function Subtract($a, $b) { $a - $b }
function Multiply($a, $b) { $a * $b }
function Divide($a, $b) { $a / $b }

Write-Host "Add 5 + 3: $(Add 5 3)"
Write-Host "Subtract 5 - 3: $(Subtract 5 3)"
Write-Host "Multiply 5 * 3: $(Multiply 5 3)"
Write-Host "Divide 6 / 2: $(Divide 6 2)"

Performs basic arithmetic operations using functions.

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PowerShell Factorial

function Factorial($n) {
    if ($n -le 1) { return 1 }
    else { return $n * (Factorial ($n - 1)) }
}

Write-Host "Factorial of 5: $(Factorial 5)"

Recursive factorial function.

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PowerShell Fibonacci Sequence

function Fibonacci($n) {
    if ($n -eq 0) { return 0 }
    elseif ($n -eq 1) { return 1 }
    else { return (Fibonacci ($n - 1)) + (Fibonacci ($n - 2)) }
}

0..9 | ForEach-Object { Write-Host (Fibonacci $_) }

Generate Fibonacci numbers using recursion.

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PowerShell Array Comprehension

$numbers = 1..10
$squares = $numbers | Where-Object { $_ % 2 -eq 0 } | ForEach-Object { $_ * $_ }
Write-Host $squares

Square even numbers using array operations.

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PowerShell Hashtable Filtering

$scores = @{ Alice=10; Bob=5; Charlie=12 }
$highScores = $scores.GetEnumerator() | Where-Object { $_.Value -ge 10 } | ForEach-Object { $_.Name, $_.Value }
Write-Host $highScores

Filtering hashtable based on values.

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PowerShell Anonymous Functions

$add = { param($x,$y) $x + $y }
Write-Host ($add.Invoke(3,7))

Using scriptblocks for anonymous functions.

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PowerShell Sum of Array

$numbers = 1,2,3,4,5
$sum = 0
foreach ($n in $numbers) { $sum += $n }
Write-Host $sum

Sum elements of an array.

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PowerShell Zip Arrays

$arr1 = 1,2,3
$arr2 = 4,5,6
for ($i=0; $i -lt $arr1.Length; $i++) { Write-Host ($arr1[$i] + $arr2[$i]) }

Combine two arrays element-wise.

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PowerShell String Manipulation

$str = 'HelloWorld'
$sub = $str.Substring(0,5)
$len = $str.Length
Write-Host "Substring: $sub, Length: $len"

Substring extraction and length.

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Frequently Asked Questions about PowerShell

What is PowerShell?

What are the primary use cases for PowerShell?

System administration & configuration. Cloud automation (Azure & Microsoft 365). DevOps & CI/CD pipelines. Remote management & orchestration. File management & process automation. Infrastructure as Code (IaC) scripting

What are the strengths of PowerShell?

Object pipeline avoids string parsing. Deep integration with Windows & Azure. Enterprise-grade automation. Extensible with .NET. Powerful remoting & orchestration

What are the limitations of PowerShell?

Slower startup vs shells like Bash. Learning curve due to object model. Platform differences between Windows & Linux. Heavy for simple one-liners. Verbose syntax compared to POSIX shells

How can I practice PowerShell typing speed?

CodeSpeedTest offers 10+ real PowerShell code examples for typing practice. You can measure your WPM, track accuracy, and improve your coding speed with guided exercises.

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Code Sample Descriptions

PowerShell Counter and Theme Toggle

$count = 0
$isDark = $false

function Update-UI {
    Write-Host "Counter: $count"
    Write-Host "Theme: $(if ($isDark) { 'Dark' } else { 'Light' })"
}

function Increment { $global:count += 1; Update-UI }
function Decrement { $global:count -= 1; Update-UI }
function Reset { $global:count = 0; Update-UI }
function Toggle-Theme { $global:isDark = -not $global:isDark; Update-UI }

# Simulate actions
Update-UI
Increment
Increment
Toggle-Theme
Decrement
Reset

Demonstrates a simple counter with theme toggling using PowerShell variables and console output.

Let’s Try →

PowerShell Simple Calculator

function Add($a, $b) { $a + $b }
function Subtract($a, $b) { $a - $b }
function Multiply($a, $b) { $a * $b }
function Divide($a, $b) { $a / $b }

Write-Host "Add 5 + 3: $(Add 5 3)"
Write-Host "Subtract 5 - 3: $(Subtract 5 3)"
Write-Host "Multiply 5 * 3: $(Multiply 5 3)"
Write-Host "Divide 6 / 2: $(Divide 6 2)"

Performs basic arithmetic operations using functions.

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PowerShell Factorial

function Factorial($n) {
    if ($n -le 1) { return 1 }
    else { return $n * (Factorial ($n - 1)) }
}

Write-Host "Factorial of 5: $(Factorial 5)"

Recursive factorial function.

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PowerShell Fibonacci Sequence

function Fibonacci($n) {
    if ($n -eq 0) { return 0 }
    elseif ($n -eq 1) { return 1 }
    else { return (Fibonacci ($n - 1)) + (Fibonacci ($n - 2)) }
}

0..9 | ForEach-Object { Write-Host (Fibonacci $_) }

Generate Fibonacci numbers using recursion.

Let’s Try →

PowerShell Array Comprehension

$numbers = 1..10
$squares = $numbers | Where-Object { $_ % 2 -eq 0 } | ForEach-Object { $_ * $_ }
Write-Host $squares

Square even numbers using array operations.

Let’s Try →

PowerShell Hashtable Filtering

$scores = @{ Alice=10; Bob=5; Charlie=12 }
$highScores = $scores.GetEnumerator() | Where-Object { $_.Value -ge 10 } | ForEach-Object { $_.Name, $_.Value }
Write-Host $highScores

Filtering hashtable based on values.

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PowerShell Anonymous Functions

$add = { param($x,$y) $x + $y }
Write-Host ($add.Invoke(3,7))

Using scriptblocks for anonymous functions.

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PowerShell Sum of Array

$numbers = 1,2,3,4,5
$sum = 0
foreach ($n in $numbers) { $sum += $n }
Write-Host $sum

Sum elements of an array.

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PowerShell Zip Arrays

$arr1 = 1,2,3
$arr2 = 4,5,6
for ($i=0; $i -lt $arr1.Length; $i++) { Write-Host ($arr1[$i] + $arr2[$i]) }

Combine two arrays element-wise.

Let’s Try →

PowerShell String Manipulation

$str = 'HelloWorld'
$sub = $str.Substring(0,5)
$len = $str.Length
Write-Host "Substring: $sub, Length: $len"

Substring extraction and length.

Let’s Try →

Frequently Asked Questions about PowerShell

What is PowerShell?

What are the primary use cases for PowerShell?

What are the strengths of PowerShell?

Object pipeline avoids string parsing. Deep integration with Windows & Azure. Enterprise-grade automation. Extensible with .NET. Powerful remoting & orchestration

What are the limitations of PowerShell?

Slower startup vs shells like Bash. Learning curve due to object model. Platform differences between Windows & Linux. Heavy for simple one-liners. Verbose syntax compared to POSIX shells

How can I practice PowerShell typing speed?

CodeSpeedTest offers 10+ real PowerShell code examples for typing practice. You can measure your WPM, track accuracy, and improve your coding speed with guided exercises.