Why expressions over statements matters in Kotlin - See It in Action

Why expressions over statements matters

📖 Scenario: Imagine you are writing a small Kotlin program to decide what to wear based on the weather. You want to use expressions instead of statements to make your code cleaner and easier to understand.

🎯 Goal: Build a Kotlin program that uses expressions instead of statements to decide and print what to wear based on the temperature.

📋 What You'll Learn

Create a variable with a temperature value

Create a variable to hold the clothing suggestion using an expression

Use an if expression to decide the clothing suggestion

Print the clothing suggestion

💡 Why This Matters

🌍 Real World

Deciding what to wear based on weather is a common real-life task. Using expressions helps write clear and concise code for such decisions.

💼 Career

Understanding expressions over statements is important for writing clean Kotlin code, which is valuable for Android development and other Kotlin-based projects.

1

DATA SETUP: Create a temperature variable

Create a variable called temperature and set it to 15.

Kotlin

// Your code here

Need a hint?

Use val to create a variable and assign the number 15 to temperature.

2

CONFIGURATION: Prepare to decide clothing

Create a variable called clothing and set it to an empty string "".

Kotlin

val temperature = 15
// Your code here

Need a hint?

Use var to create a variable clothing and assign it an empty string.

3

CORE LOGIC: Use an if expression to assign clothing

Use an if expression to assign clothing the value "Jacket" if temperature is less than 20, otherwise "T-shirt". Use the exact code clothing = if (temperature < 20) "Jacket" else "T-shirt".

Kotlin

val temperature = 15
var clothing = ""
// Your code here

Need a hint?

Use the if expression to assign clothing in one line.

4

OUTPUT: Print the clothing suggestion

Write println(clothing) to display the clothing suggestion.

Kotlin

val temperature = 15
var clothing = ""
clothing = if (temperature < 20) "Jacket" else "T-shirt"
// Your code here

Need a hint?

Use println to show the value of clothing.