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Design patterns in software development

There are numerous design patterns in software development. These design patterns are common solutions to recurring problems and provide a structured approach to designing software systems. Design patterns help improve code organization, maintainability, and scalability. They are typically categorized into several groups. One of the most well-known categorizations is based on the book "Design Patterns: Elements of Reusable Object-Oriented Software" by Erich Gamma, Richard Helm, Ralph Johnson, and John Vlissides (often referred to as the "Gang of Four" or GoF). The Gang of Four patterns categorize design patterns into three primary categories: Creational Patterns: These patterns deal with object creation mechanisms, trying to create objects in a manner suitable to the situation. Examples include: Singleton Factory Method Abstract Factory Builder Prototype Structural Patterns: Structural patterns are concerned with object composition, typically by forming larger struc...
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Android : Difference between testImplementation, implementation, testCompileOnly and api

  In the context of Android development and Gradle (the build system used for Android projects), the terms testImplementation , implementation , testCompileOnly , and api are related to dependency configurations. These configurations determine how dependencies are included in your project and which parts of your project have access to those dependencies. Let's break down each one: implementation : Dependencies declared with implementation are available to the main source set (the main body of your application code) and are internal to the module where they are declared. These dependencies are not exposed to other modules that depend on the current module. Example: gradle Copy code implementation 'com.example:library:1.0.0' testImplementation : Dependencies declared with testImplementation are only available during the test compilation and execution phases. They are not included in the main source set and won't be packaged with the final APK. These dependencies are me...
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