To “Use Templates And Keep It DRY” means to leverage templates or reusable structures and to avoid code duplication by implementing a principle of abstraction that promotes code efficiency and maintainability.
Here’s a breakdown of the concept:
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Templates: These are reusable structures, such as code snippets, document layouts, or organizational frameworks that can be used as a basis for creating multiple similar objects, saving time and effort.
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DRY (Don’t Repeat Yourself): This principle, a core concept in software development, emphasizes avoiding redundancy in code by encapsulating logic in reusable components (functions, classes, methods, etc.) instead of duplicating it in multiple places.
Benefits of Using Templates and Keeping It DRY: 
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Improved code maintainability: Reduces complexity by having logic in one place, making it easier to update and debug.
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Enhanced code reuse: Promotes efficiency by avoiding redundant code, allowing for easy replication and adaptation.
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Reduced errors: Eliminates the need to write identical code in multiple places, reducing the risk of introducing mistakes when changes are made.
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Better organization: Templates help with structuring and organizing work, leading to more streamlined processes and easier collaboration.
Examples of applying the principle:
- HTML/CSS Templates: Using base HTML/CSS structures to create different web pages.
- Code Function Reuse: Creating functions to encapsulate specific logic, allowing it to be used multiple times instead of writing it out completely.
- Document Templates: Using pre-designed layouts and formatting for documents (e.g., reports, emails).
- Database schemas: Structuring databases for efficient data storage and retrieval.
- Software Development: Using Design Patterns to create reusable solutions to common problems.