javascript / intermediate
Snippet
State Management with BehaviorSubject
A BehaviorSubject is a specialized Subject that requires an initial value and emits the current value to new subscribers immediately. It is a lightweight pattern for managing and sharing application state across services.
snippet.js
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private userState = new BehaviorSubject<User | null>(null);user$ = this.userState.asObservable();updateUser(newUser: User) {this.userState.next(newUser);}getCurrentUser() {return this.userState.value;}
angular
Breakdown
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new BehaviorSubject<User | null>(null)
Initializes the state with 'null' as the starting value.
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this.userState.next(newUser)
Updates the state and notifies all current observers of the new data.