Locomotive Engineer
10 Points
multiple-assignment-and-decomposition
Instructions
Your friend Linus is a Locomotive Engineer who drives cargo trains between cities. Although they are amazing at handling trains, they are not amazing at handling logistics or computers. They would like to enlist your programming help organizing train details and correcting mistakes in route data.
Note
This exercise could easily be solved using slicing, indexing, and various hash methods.
However, we would like you to practice packing, unpacking, and multiple assignment in solving each of the tasks below.
1. Create a list of all wagons
Your friend has been keeping track of each wagon identifier (ID), but they are never sure how many wagons the system is going to have to process at any given time. It would be much easier for the rest of the logistics program to have this data packaged into a unified array.
Implement a method generate_list_of_wagons() that accepts an arbitrary number of wagon IDs.
Each ID will be a positive integer.
The method should then return the given IDs as a single array.
LocomotiveEngineer.generate_list_of_wagons(1, 7, 12, 3, 14, 8, 5)
# => [1, 7, 12, 3, 14, 8, 5]2. Fix the list of wagons
At this point, you are starting to get a feel for the data and how it's used in the logistics program. The ID system always assigns the locomotive an ID of 1, with the remainder of the wagons in the train assigned a randomly chosen ID greater than 1.
Your friend had to connect two new wagons to the train and forgot to update the system! Now, the first two wagons in the train array have to be moved to the end, or everything will be out of order.
To make matters more complicated, your friend just uncovered a second array that appears to contain missing wagon IDs. All they can remember is that once the new wagons are moved, the IDs from this second array should be placed directly after the designated locomotive.
Linus would be really grateful to you for fixing their mistakes and consolidating the data.
Implement a method fix_list_of_wagons() that takes two arrays containing wagon IDs.
It should reposition the first two items of the first array to the end, and insert the values from the second array behind (on the right hand side of) the locomotive ID (1).
The method should then return an array with the modifications.
LocomotiveEngineer.fix_list_of_wagons([2, 5, 1, 7, 4, 12, 6, 3, 13], [3, 17, 6, 15])
# => [1, 3, 17, 6, 15, 7, 4, 12, 6, 3, 13, 2, 5]3. Add missing stops
Now that all the wagon data is correct, Linus would like you to update the system's routing information. Along a transport route, a train might make stops at a few different stations to pick up and/or drop off cargo. Each journey could have a different amount of these intermediary delivery points. Your friend would like you to update the systems routing hash with any missing/additional delivery information.
Implement a method add_missing_stops() that accepts a routing hash followed by a variable number of keyword arguments.
These arguments could be in the form of a hash holding one or more stops, or any number of stop_<number>: "city" keyword pairs.
Your method should then return the routing hash updated with an additional key that holds a array of all the added stops in order.
LocomotiveEngineer.add_missing_stops({from: "New York", to: "Miami"},
stop_1: "Washington, DC", stop_2: "Charlotte", stop_3: "Atlanta",
stop_4: "Jacksonville", stop_5: "Orlando")
# => {from: "New York", to: "Miami", stops: ["Washington, DC", "Charlotte", "Atlanta", "Jacksonville", "Orlando"]}Note
The stops will always be passed in the correct order, so you don’t need to worry about sorting them.
4. Extend routing information
Linus has been working on the routing program and has noticed that certain routes are missing some important details. Initial route information has been constructed as a hash and your friend would like you to update that hash with whatever might be missing. Every route in the system requires slightly different details, so Linus would really prefer a generic solution.
Implement a method called extend_route_information() that accepts two hashes.
The first hash contains the origin and destination cities the train route runs between.
The second hash contains other routing details such as train speed, length, or temperature. The method should return a consolidated hash with all routing information.
Note
The second hash can contain different/more properties than the ones shown in the example.
LocomotiveEngineer.extend_route_information({"from": "Berlin", "to": "Hamburg"}, {"length": "100", "speed": "50"})
# => {"from": "Berlin", "to": "Hamburg", "length": "100", "speed": "50"}Locomotive Engineer
10 Points
multiple-assignment-and-decomposition
Instructions
Your friend Linus is a Locomotive Engineer who drives cargo trains between cities. Although they are amazing at handling trains, they are not amazing at handling logistics or computers. They would like to enlist your programming help organizing train details and correcting mistakes in route data.
Note
This exercise could easily be solved using slicing, indexing, and various hash methods.
However, we would like you to practice packing, unpacking, and multiple assignment in solving each of the tasks below.
1. Create a list of all wagons
Your friend has been keeping track of each wagon identifier (ID), but they are never sure how many wagons the system is going to have to process at any given time. It would be much easier for the rest of the logistics program to have this data packaged into a unified array.
Implement a method generate_list_of_wagons() that accepts an arbitrary number of wagon IDs.
Each ID will be a positive integer.
The method should then return the given IDs as a single array.
LocomotiveEngineer.generate_list_of_wagons(1, 7, 12, 3, 14, 8, 5)
# => [1, 7, 12, 3, 14, 8, 5]2. Fix the list of wagons
At this point, you are starting to get a feel for the data and how it's used in the logistics program. The ID system always assigns the locomotive an ID of 1, with the remainder of the wagons in the train assigned a randomly chosen ID greater than 1.
Your friend had to connect two new wagons to the train and forgot to update the system! Now, the first two wagons in the train array have to be moved to the end, or everything will be out of order.
To make matters more complicated, your friend just uncovered a second array that appears to contain missing wagon IDs. All they can remember is that once the new wagons are moved, the IDs from this second array should be placed directly after the designated locomotive.
Linus would be really grateful to you for fixing their mistakes and consolidating the data.
Implement a method fix_list_of_wagons() that takes two arrays containing wagon IDs.
It should reposition the first two items of the first array to the end, and insert the values from the second array behind (on the right hand side of) the locomotive ID (1).
The method should then return an array with the modifications.
LocomotiveEngineer.fix_list_of_wagons([2, 5, 1, 7, 4, 12, 6, 3, 13], [3, 17, 6, 15])
# => [1, 3, 17, 6, 15, 7, 4, 12, 6, 3, 13, 2, 5]3. Add missing stops
Now that all the wagon data is correct, Linus would like you to update the system's routing information. Along a transport route, a train might make stops at a few different stations to pick up and/or drop off cargo. Each journey could have a different amount of these intermediary delivery points. Your friend would like you to update the systems routing hash with any missing/additional delivery information.
Implement a method add_missing_stops() that accepts a routing hash followed by a variable number of keyword arguments.
These arguments could be in the form of a hash holding one or more stops, or any number of stop_<number>: "city" keyword pairs.
Your method should then return the routing hash updated with an additional key that holds a array of all the added stops in order.
LocomotiveEngineer.add_missing_stops({from: "New York", to: "Miami"},
stop_1: "Washington, DC", stop_2: "Charlotte", stop_3: "Atlanta",
stop_4: "Jacksonville", stop_5: "Orlando")
# => {from: "New York", to: "Miami", stops: ["Washington, DC", "Charlotte", "Atlanta", "Jacksonville", "Orlando"]}Note
The stops will always be passed in the correct order, so you don’t need to worry about sorting them.
4. Extend routing information
Linus has been working on the routing program and has noticed that certain routes are missing some important details. Initial route information has been constructed as a hash and your friend would like you to update that hash with whatever might be missing. Every route in the system requires slightly different details, so Linus would really prefer a generic solution.
Implement a method called extend_route_information() that accepts two hashes.
The first hash contains the origin and destination cities the train route runs between.
The second hash contains other routing details such as train speed, length, or temperature. The method should return a consolidated hash with all routing information.
Note
The second hash can contain different/more properties than the ones shown in the example.
LocomotiveEngineer.extend_route_information({"from": "Berlin", "to": "Hamburg"}, {"length": "100", "speed": "50"})
# => {"from": "Berlin", "to": "Hamburg", "length": "100", "speed": "50"}