Examples to illustrate what `yield` does in Ruby

blocks.rb

##
# Examples without block arguments
def example_without_block(function)
  function.call + 'ay'
end
example_without_block ->{ 'ok' }
#=> "okay"

def example_explicit_block(&block)
  block.call + 'ay'
end
example_explicit_block { 'ok' }
#=> "okay"

def example_yield_block
  yield + 'ay'
end
example_yield_block { 'ok' }
#=> "okay"

##
# Examples with one block argument
def example_without_block(function)
  function.call('ay')
end
example_without_block proc { |ending| 'ok' + ending }
#=> "okay"

def example_explicit_block(&block)
  block.call('ay')
end
example_explicit_block { |ending| 'ok' + ending }
#=> "okay"

def example_yield_block
  yield('ay')
end
example_yield_block { |ending| 'ok' + ending }
#=> "okay"