method-object

Method Object Pattern

📋 Overview

The Method Object pattern converts a method into an object, enabling flexible method parameter passing and invocation.

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🎯 Intent

Problem Solved:

• Complex methods with many parameters
• Need to pass methods as parameters
• Deferred method execution
• Method state management

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👥 Roles & Responsibility

• Encapsulate method as object
• Enable method parameter passing
• Manage method state
• Support deferred execution

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📊 Class Diagram

classDiagram
    class Client
    class MethodObject {
        <<interface>>
        +execute()
    }
    class ConcreteMethodObject
    class Host {
        +helper()
    }
    Client --> MethodObject
    MethodObject <|-- ConcreteMethodObject
    ConcreteMethodObject --> Host

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🔄 Sequence Diagram

sequenceDiagram
    actor Client
    Client->>MethodObject: execute()
    MethodObject->>Host: helper()

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🌍 Real-World Use Cases

• Callback mechanisms
• Command pattern implementation
• Functional programming patterns
• Task queuing systems
• Async operation handlers

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📚 References

• Gang of Four Design Patterns
• Functional programming patterns