| function firstComeFirstServe(takeAwayOrders, eatInOrders, servedOrders) { | |
| // if any orders are not accounted for, return false | |
| if ([...takeAwayOrders, ...eatInOrders].length != servedOrders.length) { | |
| return false | |
| } | |
| servedOrders.forEach(order => { | |
| if (takeAwayOrders[0] === order) { | |
| // match! | |
| takeAwayOrders.shift() | |
| } else if (eatInOrders[0] === order) { | |
| // match! | |
| eatInOrders.shift() | |
| } else { | |
| // no match, not first-come first-serve | |
| return false | |
| } | |
| }) | |
| // check for remaining extra orders | |
| return [...takeAwayOrders, ...eatInOrders].length == 0 ? true : false | |
| } |