| def first_come_first_served?(take_away_orders, eat_in_orders, served_orders) | |
| served_orders.each do |order| | |
| if take_away_orders[0] === order | |
| # match! | |
| take_away_orders.shift() | |
| elsif eat_in_orders[0] === order | |
| # match! | |
| eat_in_orders.shift() | |
| else | |
| # no match, not first-come first-serve | |
| return false | |
| end | |
| end | |
| # check for remaining extra orders | |
| return take_away_orders.concat(eat_in_orders).length == 0 ? true : false | |
| end |