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Using Sprout and Wrap Techniques

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Overview

Sprout and wrap techniques help safely add or modify functionality in existing code by introducing new methods, classes, or wrappers. These approaches minimize risk, preserve legacy behavior, and improve testability. This course covers both techniques for refactoring and expanding Scala code.

Syllabus

Unit 1: Sprout Method - Reducing Risk of Adding New Features

Sprouting a New Order Processing Method
Testing Order Processing with Surcharges
Testing Empty Orders with Surcharges
Testing Negative Surcharges with Parametrized Tests
Testing Order Processing with Surcharges

Unit 2: Sprout Method - When a Method Does Too Much

Extract Customer Lookup Method
Extract Order Calculation Logic
Extract Payment Logic for Better Code
Extract Order Status Update Method
Extract Email Confirmation Method

Unit 3: Wrap Method - Safely Adding New Behaviors to Existing Code

Extract Method Refactoring Pattern
Adding Fraud Detection to OrderProcessor
Using the New Dependency to Prevent Fraud
Testing Fraud Detection with Mocks
Testing Order Processing Without Fraud

Unit 4: Sprout Class - When Classes Do Too Much

Creating a Metrics Collector Class
Order Metrics Collection System
Adding Metrics Collector Dependency
Metrics Collection Refactoring

Unit 5: Sprout Class - When New Shouldn't Affect Old

Enhancing Order System with Customer Features
Loyalty Rewards for Valued Customers
Building a Discount Order Processor
Discount Processing for Loyal Customers

Unit 6: Wrap Class - Expanding Whole Class Behavior

Create a Trait for Order Processing
Creating the new Order Processor that Logs Events
Adding Logs to Order Processing
Complete the Order Cancellation Logger

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