Ruby Academy · Lesson

Yield and Passing Blocks

Explore the yield keyword and how to pass blocks to methods dynamically.

Lesson 3 of 310 steps

Yield and Passing Blocks 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.

Yield and Passing Blocks

Ruby allows passing blocks to methods using the yield keyword.

In this lesson, you will learn how to use yield to execute a block inside a method.

Yield and Passing Blocks — illustration 1

Using Yield

The yield keyword runs the block given to the method.

def greet
  puts 'Before yield'
  yield
  puts 'After yield'
end

greet { puts 'Hello from the block!' }

Passing Parameters with Yield

The yield keyword can pass parameters to the block.

def square(num)
  yield num * num
end

square(4) { |result| puts "Square: #{result}" }

Checking if a Block is Given

You can check if a method received a block using block_given?.

def greet
  if block_given?
    yield
  else
    puts 'No block given'
  end
end

greet

greet { puts 'Hello from block!' }

Passing Blocks with &block

Blocks can be passed explicitly as a parameter using &block.

def execute_block(&block)
  block.call if block
end

execute_block { puts 'Block executed!' }

Using Yield Multiple Times

A method can call yield multiple times.

def repeat(times)
  times.times { yield }
end

repeat(3) { puts 'Hello!' }

Passing Blocks as Procs

Blocks can be converted to Procs and passed as arguments.

def execute_proc(proc)
  proc.call
end

my_proc = Proc.new { puts 'Proc executed!' }
execute_proc(my_proc)

Answer it in the interactive lesson

Using Lambda as a Block

A lambda can be used in place of a block.

def execute_lambda(lmbd)
  lmbd.call
end

my_lambda = -> { puts 'Lambda executed!' }
execute_lambda(my_lambda)

Congratulations!

You have learned how to use yield and pass blocks in Ruby.

Next, you will learn about working with collections.

Yield and Passing Blocks — illustration 10

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Frequently Asked Questions

Is the “Yield and Passing Blocks” lesson free?

Yes — any 3 lessons of the Ruby Academy learning path, including “Yield and Passing Blocks”, 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 “Yield and Passing Blocks”?

Explore the yield keyword and how to pass blocks to methods dynamically. 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 “Yield and Passing Blocks” 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.

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