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Kotlin
StateFlow — Observable State
`StateFlow<T>` is a hot Flow holding a single current value. Perfect for UI state in Compose/Android — always has a value, conflates intermediate values, multi-subscriber.
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JavaScript
Observable / Reactive State
A minimal reactive state container. Wrap any object with observable() and it returns a Proxy that notifies subscribers whenever a property is set. subscribe() registers a listener that receives the changed key and new value. A lightweight alternative to MobX or Vue's reactive() for small-scale reactivity needs.