Array Patterns

Array patterns destructure positions into named variables.

array_patterns.rb

amount = 
command = ["add", amount]

case command
in ["add", value]
  result = value + 10
in ["remove", value]
  result = 10 - value
else
  result = 0
end

puts "command=#{command.join(",")}"
puts "result=#{result}"

amount = 
command = ["add", amount]

case command
in ["add", value]
  result = value + 10
in ["remove", value]
  result = 10 - value
else
  result = 0
end

puts "command=#{command.join(",")}"
puts "result=#{result}"

amount = 
command = ["add", amount]

case command
in ["add", value]
  result = value + 10
in ["remove", value]
  result = 10 - value
else
  result = 0
end

puts "command=#{command.join(",")}"
puts "result=#{result}"

array pattern An array pattern can match shape and assign elements to local variables.