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Ruby Academy · Lesson

Logical and Comparison Operators

Learn how to use logical (&&, ||, !) and comparison (==, !=, >, <) operators in Ruby programs.

Lesson 3 of 310 steps

Logical and Comparison Operators is a free Ruby Academy lesson on CoddyKit. This is lesson 3 of 3. Any 3 lessons of this learning path are free to read in full — after that, CoddyKit PRO unlocks every lesson, plus hands-on practice with a built-in code editor and a 24/7 AI tutor. It is part of the Ruby Academy learning path, and your progress syncs across the web and the CoddyKit app. The Ruby Academy course includes 3 lessons in total.

Logical and Comparison Operators

Logical and comparison operators help you make decisions in Ruby programs.

In this lesson, you will learn how to use ==, !=, >, <, &&, ||, and ! operators.

Logical and Comparison Operators — illustration 1

Comparison Operators

Comparison operators are used to compare values.

puts 10 == 10  # true
puts 10 != 5   # true
puts 10 > 5    # true
puts 10 < 5    # false

Logical AND (&&) Operator

The && operator returns true only if both conditions are true.

puts true && true   # true
puts true && false  # false

Logical OR (||) Operator

The || operator returns true if at least one condition is true.

puts true || false  # true
puts false || false # false

Logical NOT (!) Operator

The ! operator negates a boolean value.

puts !true  # false
puts !false # true

Combining Operators

You can combine logical and comparison operators in a single expression.

age = 25
puts age > 18 && age < 30  # true

Short-Circuit Evaluation

Ruby stops evaluating an expression as soon as the result is determined.

puts true || (puts 'Not executed') # 'true' and skips the second part

Answer it in the interactive lesson

The Spaceship Operator ()

The <=> operator returns:

  • -1 if the left operand is smaller
  • 0 if both are equal
  • 1 if the left operand is greater
puts 10 <=> 5   # 1
puts 10 <=> 10  # 0
puts 5 <=> 10   # -1

Congratulations!

You have learned how to use logical and comparison operators in Ruby.

Next, you will learn about methods and blocks.

Logical and Comparison Operators — illustration 10
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Frequently Asked Questions

Is the “Logical and Comparison Operators” lesson free?

Yes — any 3 lessons of the Ruby Academy learning path, including “Logical and Comparison Operators”, are free to read in full here on the web. After that, CoddyKit PRO unlocks every lesson, plus interactive practice with a built-in code editor and a 24/7 AI tutor. The Ruby Academy course includes 3 lessons in total.

What will I learn in “Logical and Comparison Operators”?

Learn how to use logical (&&, ||, !) and comparison (==, !=, >, <) operators in Ruby programs. You practise Ruby Academy with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.

Do I need any experience to start Ruby Academy?

No prior experience is required. Ruby Academy on CoddyKit is structured for beginners through advanced learners, so you can start here or from the beginning and move at your own pace. This is lesson 3 of 3.

How long does the “Logical and Comparison Operators” lesson take?

Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.

Can I write and run code in this Ruby Academy lesson?

Yes. Every Ruby Academy lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.

All lessons in this course

  1. Conditional Statements
  2. Loops and Iterators
  3. Logical and Comparison Operators
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