8 Questions
What is the key benefit of the strategy pattern in the context of the navigation app?
It enables the separation of algorithmic concerns, making the code more modular and maintainable
Which design pattern could be used to implement a family of algorithms for routing, similar to the strategy pattern?
Bridge
What is the main challenge faced by the development team in implementing new routing algorithms?
The risk of introducing errors in already-working code
Which design pattern could be used to add new features to the routing algorithm without changing the existing code?
Decorator
What is the main reason why the development team is struggling with merge conflicts?
The use of a single, large class for all routing algorithms
Which design pattern could be used to reduce the memory footprint of the routing algorithm by sharing common data?
Flyweight
What is the primary goal of the strategy pattern in the context of the navigation app?
To provide a flexible way to implement different routing algorithms
Which design pattern could be used to create a unified interface for different routing algorithms?
Bridge
Study Notes
Navigation App Development
- A navigation app for casual travelers was created, centered around a map that helps users orient themselves in any city.
- The app's most requested feature was automatic route planning, which displayed the fastest route to a destination.
Initial Route Planning Implementations
- The app initially only built routes over roads, catering to car travelers.
- Later, walking routes were added as an option.
- Another option was added to let people use public transport in their routes.
Future Development Plans
- Plans were made to add route building for cyclists.
- Another option for building routes through all of a city's tourist attractions was also planned.
Technical Challenges
- Each time a new routing algorithm was added, the main class of the navigator grew in size, becoming too hard to maintain.
- Changes to one of the algorithms affected the whole class, increasing the chance of creating an error in already-working code.
- Teamwork became inefficient due to constant merge conflicts when implementing new features.
Problem in Need of a Solution
- The main class became too large and difficult to manage, requiring a solution to separate the algorithms and make them interchangeable.
Learn about the Strategy pattern, a behavioral design pattern that enables interchangeable algorithm objects. Apply it to a real-world scenario in navigation app development.
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