# Helper:
# alternative `puts` with a non-nil return value
# similar to many method calls which could be useful with logical operations
def puts_with_true(arg)
  puts(arg)
  true
end

# puts returns `nil` by default
puts 1 && 2
2 # printed
#=> nil
# `1 && 2` is evaluated first, then it's printed
# read: puts (1 && 2)
#       puts 2

puts 3 and 4
3 # printed
#=> nil
# `puts 3` is evaluated, returns `nil`
# so `and 4` does not do anything
# read: (puts 3) and 4
#       nil      and 4

# when first part of the expression returns a truthy value:

puts_with_true 5 && 6
6 # printed
#=> 6
# `5 && 6` returns 6,
# and this is printed and returned finally
# read: puts_with_true (5 && 6)
#       puts_with_true 6

puts_with_true 7 and 8
7 # printed
#=> 8
# `puts_with_true 7` returns true,
# therefore `and 8` is evaluated and returns `8` as final value
# read: (puts_with_true 7) and 8
#       true               and 8

# `and` has lower precedence than `&&`