Flyweight pattern in LLD - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the main goal of the Flyweight pattern?

The Flyweight pattern aims to reduce memory usage by sharing common parts of objects instead of creating many similar objects.

intermediate

In the Flyweight pattern, what are intrinsic and extrinsic states?

Intrinsic state is the shared, unchanging data stored inside the flyweight. Extrinsic state is the unique data passed from outside when using the flyweight.

intermediate

How does the Flyweight pattern improve system scalability?

By sharing common data among many objects, it reduces memory consumption, allowing the system to handle more objects efficiently.

beginner

Give a real-life example that illustrates the Flyweight pattern.

Imagine a text editor where each letter shares the same font style and size (intrinsic state), but their position on the screen (extrinsic state) is unique. This sharing saves memory.

intermediate

What is a common structure used to manage flyweight objects?

A Flyweight Factory is used to create and manage flyweight objects, ensuring shared objects are reused instead of duplicated.

What does the Flyweight pattern primarily help to reduce?

A Network latency

B Memory usage

C CPU usage

D Database size

The Flyweight pattern reduces memory usage by sharing common parts of objects.

Which state in the Flyweight pattern is shared among objects?

A Dynamic state

B Extrinsic state

C Intrinsic state

D Temporary state

Intrinsic state is the shared, unchanging data stored inside the flyweight.

What role does the Flyweight Factory play?

A Creates new unique objects every time

B Handles user authentication

C Deletes unused objects immediately

D Manages and reuses shared flyweight objects

The Flyweight Factory manages and reuses shared flyweight objects to save memory.

Which scenario best fits the Flyweight pattern?

A Many objects with identical data

B Few objects with unique data

C Objects with no shared data

D Objects that never change

Flyweight is best when many objects share identical data to reduce memory use.

In the text editor example, what is an example of extrinsic state?

A Letter position on screen

B Font style

C Font size

D Character shape

Letter position is unique and passed externally, so it is extrinsic state.

Explain the Flyweight pattern and how it helps save memory in software systems.

Think about sharing common parts of objects instead of duplicating.

Describe the role of a Flyweight Factory and why it is important.

Consider how objects are created and reused.