Case with ranges and patterns in Ruby - Mini Project: Build & Apply

Case with ranges and patterns

📖 Scenario: You are creating a simple program to categorize ages into life stages using Ruby's case statement with ranges and pattern matching.

🎯 Goal: Build a Ruby program that uses a case statement with ranges and patterns to print the life stage for a given age.

📋 What You'll Learn

Create a variable age with a specific integer value.

Create a variable adult_age to set the minimum adult age.

Use a case statement with ranges and pattern matching to determine the life stage.

Print the life stage as output.

💡 Why This Matters

🌍 Real World

Categorizing ages into groups is common in apps like surveys, games, or health trackers.

💼 Career

Understanding <code>case</code> with ranges and patterns helps in writing clear, readable decision-making code in Ruby.

1

DATA SETUP: Create the age variable

Create a variable called age and set it to the integer 25.

Ruby

# Create a variable called age and set it to 25
# Your code here

Need a hint?

Use = to assign the value 25 to the variable age.

2

CONFIGURATION: Create the adult_age variable

Create a variable called adult_age and set it to the integer 18.

Ruby

age = 25
# Create a variable called adult_age and set it to 18
# Your code here

Need a hint?

Use = to assign the value 18 to the variable adult_age.

3

CORE LOGIC: Use case with ranges and pattern matching

Write a case statement using the variable age to match these ranges and patterns:
- When age is between 0 and 12 (inclusive), assign stage the string "Child".
- When age is between 13 and 17 (inclusive), assign stage the string "Teenager".
- When age is greater than or equal to adult_age, assign stage the string "Adult".
- Otherwise, assign stage the string "Unknown".

Ruby

age = 25
adult_age = 18
# Use a case statement with ranges and patterns to assign stage
# Your code here

Need a hint?

Use case age and when with ranges like 0..12. Use Float::INFINITY for open-ended ranges.

4

OUTPUT: Print the life stage

Write a puts statement to print the value of the variable stage.

Ruby

age = 25
adult_age = 18

stage = case age
when 0..12
  "Child"
when 13..17
  "Teenager"
when adult_age..Float::INFINITY
  "Adult"
else
  "Unknown"
end

# Print the stage variable
# Your code here

Need a hint?

Use puts stage to print the life stage.