Design Patterns: Strategy Pattern
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Questions and Answers

What is the key benefit of the strategy pattern in the context of the navigation app?

  • It provides a way to reduce the number of classes in the app's codebase
  • It allows for the creation of a single, large class that handles all routing algorithms
  • It enables the separation of algorithmic concerns, making the code more modular and maintainable (correct)
  • It is a design pattern specifically tailored for navigation apps
  • Which design pattern could be used to implement a family of algorithms for routing, similar to the strategy pattern?

  • State
  • Bridge (correct)
  • Template Method
  • Memento
  • What is the main challenge faced by the development team in implementing new routing algorithms?

  • The risk of introducing errors in already-working code (correct)
  • The need to create a new class for each algorithm
  • The difficulty of debugging the existing codebase
  • The need to rewrite the entire app from scratch
  • Which design pattern could be used to add new features to the routing algorithm without changing the existing code?

    <p>Decorator</p> Signup and view all the answers

    What is the main reason why the development team is struggling with merge conflicts?

    <p>The use of a single, large class for all routing algorithms</p> Signup and view all the answers

    Which design pattern could be used to reduce the memory footprint of the routing algorithm by sharing common data?

    <p>Flyweight</p> Signup and view all the answers

    What is the primary goal of the strategy pattern in the context of the navigation app?

    <p>To provide a flexible way to implement different routing algorithms</p> Signup and view all the answers

    Which design pattern could be used to create a unified interface for different routing algorithms?

    <p>Bridge</p> Signup and view all the answers

    Study Notes

    • 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.

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    Description

    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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