Blocks Yield

A Ruby method can call yield to run a block supplied by the caller.

blocks_yield.rb

def with_greeting(name)
  puts "before block"
  yield(name)
  puts "after block"
end

name = 

with_greeting(name) do |value|
  puts "hello #{value}"
end

def with_greeting(name)
  puts "before block"
  yield(name)
  puts "after block"
end

name = 

with_greeting(name) do |value|
  puts "hello #{value}"
end

def with_greeting(name)
  puts "before block"
  yield(name)
  puts "after block"
end

name = 

with_greeting(name) do |value|
  puts "hello #{value}"
end

yield `yield` transfers control from a method to the block passed with the method call.