observe()

import { observe } from "@fed1/jsos";

The JSFunction observe() adds a listener callback to an observable object.

The following built-ins produce observable objects:

Usage

observe(obj, listener)

#	Parameter	Required?	Type	Default
1	obj	yes	JSObject
2	listener	yes	JSFunction

The object to be observed. Must have been made observable.

The listener callback that is called when changes occur.

The number of arguments depends on the observable object, but usually it's a key as the first argument and a value as the second argument.

A JSFunction that, when called, unsubscribes listener.

Feature	Since version
observe()	1.0