Ternary operator usage in Ruby

Introduction

The ternary operator helps you choose between two values quickly in one line. It makes simple decisions easy to write and read.

When you want to assign a value based on a quick yes/no question.

When you want to print one message if something is true, and another if it is false.

When you want to shorten an if-else statement that fits in one line.

When you want to make your code cleaner and easier to understand for simple choices.

Syntax

Ruby

condition ? value_if_true : value_if_false

The condition is a question that is either true or false.

If the condition is true, the code uses value_if_true. Otherwise, it uses value_if_false.

Examples

This checks if age is 18 or more. If yes, it returns "Adult", else "Child".

Ruby

age >= 18 ? "Adult" : "Child"

Returns "Pass" if score is greater than 50, otherwise "Fail".

Ruby

score > 50 ? "Pass" : "Fail"

Chooses what message to show based on whether it is raining.

Ruby

is_raining ? "Take umbrella" : "No umbrella needed"

Sample Program

This program asks for your age, then uses the ternary operator to decide if you are an adult or a child. It prints the result.

Ruby

puts "Enter your age:"
age = gets.to_i
status = age >= 18 ? "Adult" : "Child"
puts "You are a(n) #{status}."

Important Notes

The ternary operator is best for simple decisions. For complex choices, use full if-else blocks.

Remember to keep the code readable. If the line gets too long, break it into multiple lines.

Summary

The ternary operator is a short way to choose between two values.

It uses the format: condition ? value_if_true : value_if_false.

Use it to make your code cleaner for simple yes/no decisions.