Real World Analogies and Code Example

Grokking SOLID Design Principles

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In the previous lesson, we learned the definition of the Open/Closed Principle (OCP). Now, in this lesson, we’ll explore a real-world coding example to understand how this principle is applied.

Initial Code Example Without OCP

Let’s start with a code example where all methods and logic are placed within a single class. This approach violates the Open/Closed Principle because adding new functionality will require us to modify the existing class.

In this example, the Invoice class is responsible for generating invoices and applying discounts

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