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Interface Segregation Principle (ISP) Explained in Seconds

Patricia Arquette

Jan 21, 2025 pm 12:07 PM

? Interface Segregation Principle (ISP) Explained Simply

The ISP, a core component of the SOLID design principles, states: Clients shouldn't be forced to depend on methods they don't use.

Overly broad interfaces, packed with unrelated methods, lead to classes burdened with unnecessary code. This results in brittle, difficult-to-maintain systems. ISP advocates for smaller, more focused interfaces for cleaner, more manageable code.

? A Simple Analogy

Imagine a restaurant menu overflowing with dishes you dislike. Navigating this unwieldy menu is frustrating! Now picture specialized menus: one for sandwiches, another for sushi, a third for desserts. Ordering becomes significantly easier. This illustrates the essence of ISP:

? Avoid massive, generic interfaces with unused methods.

✅ Embrace small, targeted interfaces tailored to specific client needs.

Interface Segregation Principle (ISP) Explained in Seconds

Code Examples

Interface Segregation Principle (ISP) Explained in Seconds

? Key Advantages

✅ Eliminates unnecessary methods: Classes only implement the methods they require.

✅ Improves code readability, maintainability, and extensibility.

✅ Promotes cleaner design: No more unused or unsupported methods.

⚠️ Recognizing ISP Violations

❌ Overly large interfaces. ❌ Unimplemented methods in classes.

? Avoiding ISP Violations

✅ Refactor large interfaces into smaller, more specialized ones. ✅ Implement only necessary methods—classes should only handle relevant functionality. ✅ Prioritize composition over inheritance for greater flexibility and extensibility without compromising ISP.

? Explore More

Want to learn more? Explore other posts in my programming principles series!

Liskov Substitution Principle (LSP) Explained in 100 Seconds
KISS Design Principle Explained in 100 Seconds
DRY Principle Explained in 100 Seconds
"Tell, Don't Ask" Principle Explained in 100 Seconds
Golang Dependency Injection - Just in 5 Minutes!

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