Creational Patterns

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1. 1 What is the Singleton pattern, and what are its downsides in a testable frontend codebase? Medium
2. 2 What is the Factory pattern, and when does it beat a plain constructor or object literal? Medium
3. 3 How does the Builder pattern help with objects that have many optional configurations? Medium
4. 4 What is the module pattern in JavaScript, and how did closures make it work pre-ESM? Easy
5. 5 How do you implement dependency injection in a frontend app, and why would you? Hard