String concatenation in PowerShell - Mini Project: Build & Apply

String concatenation

📖 Scenario: You are creating a simple script to combine parts of a person's name into a full name. This is like putting together pieces of a puzzle to see the whole picture.

🎯 Goal: Build a PowerShell script that creates a full name by joining first name, middle name, and last name using string concatenation.

📋 What You'll Learn

Create variables for first name, middle name, and last name with exact values.

Create a variable for a space character to use as a separator.

Concatenate the names with spaces in between using the + operator.

Print the full name to the console.

💡 Why This Matters

🌍 Real World

Combining strings is common when creating messages, file paths, or user information in scripts.

💼 Career

Knowing how to join strings helps automate report generation, logging, and user interface text in many IT and scripting jobs.

1

Create name parts

Create three variables called $firstName, $middleName, and $lastName with the exact values "John", "F.", and "Kennedy" respectively.

PowerShell

# Create variables $firstName, $middleName, and $lastName with given values
# Your code here

Hint

Use the = sign to assign the exact strings to each variable.

2

Create space separator

Create a variable called $space and assign it the exact value of a single space character " ".

PowerShell

$firstName = "John"
$middleName = "F."
$lastName = "Kennedy"

# Create variable $space with a single space string
# Your code here

Hint

Remember a space is just a string with one space character inside quotes.

3

Concatenate full name

Create a variable called $fullName that concatenates $firstName, $space, $middleName, $space, and $lastName using the + operator.

PowerShell

$firstName = "John"
$middleName = "F."
$lastName = "Kennedy"

$space = " "

# Concatenate $fullName using + operator
# Your code here

Hint

Use the plus sign + to join strings together in PowerShell.

4

Print the full name

Write a line to print the variable $fullName to the console using Write-Output.

PowerShell

$firstName = "John"
$middleName = "F."
$lastName = "Kennedy"

$space = " "

$fullName = $firstName + $space + $middleName + $space + $lastName

# Print $fullName to the console
# Your code here

Hint

Use Write-Output $fullName to show the full name on the screen.

Practice

1. Which operator is used in PowerShell to join two strings together?

easy

A. /

B. -

C. +

D. *

Solution

1. Step 1: Understand string joining in PowerShell

   PowerShell uses the plus sign (+) to concatenate or join strings.

2. Step 2: Identify the correct operator

   Among the options, only + is used for string concatenation.

3. Final Answer:

   + -> Option C

4. Quick Check:

   String concatenation operator = + [OK]

Hint: Use + to join strings simply in PowerShell [OK]

Common Mistakes:

• Using - instead of +
• Trying to use * for strings
• Using / which is division

2. Which of the following is the correct syntax to concatenate variables $a and $b with a space between them in PowerShell?

easy

A. $a + ' ' + $b

B. $a - ' ' - $b

C. $a * ' ' * $b

D. $a / ' ' / $b

Solution

1. Step 1: Check operator for concatenation

   PowerShell uses + to join strings, so + is correct here.

2. Step 2: Confirm space inclusion

   Adding ' ' between variables adds a space between the joined strings.

3. Final Answer:

   $a + ' ' + $b -> Option A

4. Quick Check:

   Concatenate with + and add space as ' ' [OK]

Hint: Add spaces manually with ' ' when joining strings [OK]

Common Mistakes:

• Using - instead of +
• Forgetting to add space
• Using * or / operators

3. What will be the output of this PowerShell code?

$name = "John"
$greeting = "Hello, " + $name + "!"
Write-Output $greeting

medium

A. Hello, John!

B. Hello, $name!

C. Hello, !

D. JohnHello, !

Solution

1. Step 1: Understand variable values

   $name contains "John" and is concatenated with strings using +.

2. Step 2: Evaluate concatenation

   "Hello, " + $name + "!" becomes "Hello, John!" as $name is replaced by its value.

3. Final Answer:

   Hello, John! -> Option A

4. Quick Check:

   Concatenate strings and variable value = Hello, John! [OK]

Hint: Variables inside double quotes concatenate with + correctly [OK]

Common Mistakes:

• Expecting $name to print literally
• Missing + operator
• Confusing output order

4. Identify the error in this PowerShell code snippet:

$first = "Good"
$second = "Morning"
$message = $first + $second
Write-Output $message

medium

A. Incorrect use of + operator

B. Missing space between words in concatenation

C. Variables not declared properly

D. Write-Output is invalid command

Solution

1. Step 1: Check concatenation result

   $first + $second joins "Good" and "Morning" without space, resulting in "GoodMorning".

2. Step 2: Identify missing space

   To separate words, a space string ' ' should be added between variables.

3. Final Answer:

   Missing space between words in concatenation -> Option B

4. Quick Check:

   Concatenation lacks space, so words join directly [OK]

Hint: Add ' ' between strings to include spaces [OK]

Common Mistakes:

• Assuming + adds space automatically
• Thinking variables are undeclared
• Believing Write-Output is wrong

5. You want to create a full name string from variables $firstName and $lastName with a space in between. Which of these PowerShell commands correctly does this and outputs the full name?

hard

A. Write-Output $firstName * ' ' * $lastName

B. Write-Output $firstName + $lastName

C. Write-Output $firstName - $lastName

D. Write-Output "$firstName $lastName"

Solution

1. Step 1: Understand string interpolation in double quotes

   Using double quotes with variables inside inserts their values with spaces as typed.

2. Step 2: Compare options

   Write-Output "$firstName $lastName" uses double quotes with space between variables, producing correct full name with space.

3. Final Answer:

   Write-Output "$firstName $lastName" -> Option D

4. Quick Check:

   Double quotes allow variable insertion with spaces easily [OK]

Hint: Use double quotes to insert variables with spaces easily [OK]

Common Mistakes:

• Forgetting space in concatenation
• Using - or * operators incorrectly
• Not using double quotes for interpolation