Essential Ruby

String interpolation

suggest change

The double-quoted delimiter " and %Q sequence supports string interpolation using #{ruby_expression}: 

puts "Now is #{Time.now}"
# Now is Now is 2016-07-21 12:47:45 +0200

puts %Q(Now is #{Time.now})
# Now is Now is 2016-07-21 12:47:45 +0200
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