Singleton Pattern - Design Patterns in JavaScript

Repository: https://github.com/TomDoesTech/js-des... The singleton pattern limits the instantiation of an object to a single instance, helps coordinate data, and functions across the application, and can help to reduce unnecessary memory usage. 0:00 Intro 1:46 Simple example 5:52 Realistic example with a classe 8:56 Realistic example with a function 11:50 Outro Why not use singletons? May introduce unnecessary restrictions Singletons are available anywhere in the application by anything, which may mean that dependencies may not be immediately visible, meaning developers may need to know the inner workings of the singleton It May be difficult to test Requirements Ensure that only one instance of the singleton exists Provide global access to the instance Examples Logging function - Don't want a new instance of the logger for every log Global config - Config should come from a single source of truth Database connections - Many instances can increase memory usage Video structure Simple example Database connection example with a class Database connection example with a function 🌎 Follow me here: Discord:   / discord   Twitter:   / tomdoes_tech   Facebook:   / tomdoestech​   Instagram:   / tomdoestech​   TikTok:   / tomdoes_tech   ☕ Buy me a coffee: https://www.buymeacoffee.com/tomn