Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

[Idea] Make it possible for BehaviorSubject to emit an initial "summary" value to late subscribers #7297

Open
wants to merge 2 commits into
base: master
Choose a base branch
from
Open

[Idea] Make it possible for BehaviorSubject to emit an initial "summary" value to late subscribers #7297

Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
aaf1c68
Update BehaviorSubject.ts
vkryachko Jun 28, 2023
d248417
Update BehaviorSubject.ts
vkryachko Jun 28, 2023
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
5 changes: 3 additions & 2 deletions src/internal/BehaviorSubject.ts
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -7,7 +7,7 @@ import { Subscription } from './Subscription';
* value whenever it is subscribed to.
*/
export class BehaviorSubject<T> extends Subject<T> {
constructor(private _value: T) {
constructor(private _value: T, private readonly _valueFold: (currentValue: T, newValue: T) => T = (_, v) => v) {
super();
}

Expand All @@ -31,6 +31,7 @@ export class BehaviorSubject<T> extends Subject<T> {
}

next(value: T): void {
super.next((this._value = value));
this._value = this._valueFold(this._value, value);
super.next(value);
}
}