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def foo(greeting)
	puts 'Inside the function foo'
	yield(greeting)
	puts 'Back inside the function foo'
end
foo("Top of the mornin to ya!") { |greeting| puts "#{greeting} John" }

Inside the function foo
Top of the mornin to ya! John
Back inside the function foo

Inside the function foo
Top of the mornin to ya John
Back inside the function foo

foo("Top of the mornin to ya!") { |greeting| puts "#{greeting} John" }

foo("Top of the mornin to ya") { |greeting| puts "#{greeting} John" }

// javascript
for (let i = 0; i < 100; i++) {
  console.log(i)
  i += 3
}
// => prints 0, 4, 8, 12...

# ruby
for i in (0..100)
  p i
  i += 3
end
# => prints 0 to 100