String concatenation vs templates in Kotlin - Hands-On Comparison

String concatenation vs templates

📖 Scenario: You are creating a simple program to greet users by their names and ages. You want to see two ways to build the greeting message: one by joining strings manually and another by using Kotlin's string templates.

🎯 Goal: Build a Kotlin program that creates a greeting message using string concatenation and then using string templates. Finally, print both messages to compare.

📋 What You'll Learn

Create variables for name and age with exact values

Create a greeting message using string concatenation

Create a greeting message using string templates

Print both greeting messages

💡 Why This Matters

🌍 Real World

Building user-friendly messages in apps, like greetings, notifications, or reports, often requires combining text with variable data.

💼 Career

Knowing how to create readable and maintainable strings is essential for software developers, especially when working on user interfaces or generating dynamic content.

1

Create variables for name and age

Create a String variable called name with the value "Alice" and an Int variable called age with the value 30.

Kotlin

# Create variables 'name' and 'age' with given values
// Your code here

Need a hint?

Use val to create variables and assign the exact values.

2

Create greeting message using string concatenation

Create a String variable called greetingConcat that uses string concatenation with name and age to form the message: Hello, my name is Alice and I am 30 years old.

Kotlin

val name: String = "Alice"
val age: Int = 30
// Create 'greetingConcat' using string concatenation
// Your code here

Need a hint?

Use the + operator to join strings and variables.

3

Create greeting message using string templates

Create a String variable called greetingTemplate that uses Kotlin string templates with name and age to form the same message: Hello, my name is Alice and I am 30 years old.

Kotlin

val name: String = "Alice"
val age: Int = 30
val greetingConcat: String = "Hello, my name is " + name + " and I am " + age + " years old."
// Create 'greetingTemplate' using string templates
// Your code here

Need a hint?

Use $variableName inside the string to insert variable values.

4

Print both greeting messages

Print the variables greetingConcat and greetingTemplate each on its own line using println.

Kotlin

val name: String = "Alice"
val age: Int = 30
val greetingConcat: String = "Hello, my name is " + name + " and I am " + age + " years old."
val greetingTemplate: String = "Hello, my name is $name and I am $age years old."
// Print both greeting messages
// Your code here

Need a hint?

Use println(greetingConcat) and println(greetingTemplate) to show the messages.