Yield in ruby

yield.rb

def calculation(a, b, operation)
  operation.call(a, b)
end

puts calculation(5, 6, lambda { |a, b| a + b }) # addition
# OR puts calculation(5, 6, ->(a, b) { a + b })
# OR puts calculation(5, 6, Proc.new{ |a, b| a + b })
# OR puts calculation(5, 6, proc{ |a, b| a + b })
puts calculation(5, 6, lambda { |a, b| a - b }) # subtraction

def calculation2(a, b)
  yield(a, b) # Pass parameters to block
end
# Pass a block when using yeild
puts calculation2(5, 6) { |a, b| a + b } # addition
puts calculation2(5, 6) { |a, b| a - b } # subtraction
# prevent exception raised when using yield
def foo
  yield if block_given?
end
# REMEMBER: yeild gives us better perfomance