observer-hooks

Observable Hooks

Observable Module This is a lightweight and reusable Observable module inspired by React hooks. It provides a simple way to observe changes to an object's properties and subscribe to those changes using callback functions.

Installations

To use this module, simply import the useObservable function from the observable-hooks file:

import useObservable from "observable-hooks";

Usage

• Create an observable object:

const person = { name: "John", age: 30 };
const observable = useObservable(person);

• Subscribe to changes:

const unsubscribe = observable.subscribe((prop, value) => {
  console.log(`${prop} changed to ${value}`);
});

• Update properties:

observable.set("age", 31); // Output: "age changed to 31"
observable.set("name", "Jane"); // Output: "name changed to Jane"

• Unsubscribe from changes (optional):

unsubscribe();

API useObservable(obj)

obj (Object): The object to be observed. Returns an object with the following methods:

subscribe(callback)

callback (Function): The function to be called when a property changes. It receives two arguments: prop (the property name) and value (the new value).

unsubscribe(callback)

callback (Function): The function to be unsubscribed from property changes.

set(prop, value)

prop (string): The property name to update. value (any): The new value for the property.

get(prop)

prop (string): The property name to retrieve. Returns the current value of the property.

Simple Object and array Observable

import useObservable from "observable-hooks";

const person = { name: "John", age: 30 };
const observable = useObservable(person);

const unsubscribe = observable.subscribe((prop, value) => {
  console.log(`${prop} changed to ${value}`);
});

observable.set("age", 31); // Output: "age changed to 31"
observable.set("name", "Jane"); // Output: "name changed to Jane"

unsubscribe();

observable.set("age", 32); // No output

Nested Object and array Observable

import useObservable from "observable-hooks";

const person = { name: "John", age: 30, address: { city: "New York" } };
const observable = useObservable(person);

const unsubscribe = observable.subscribe((path, value) => {
  console.log(`${path} changed to ${value}`);
});

observable.set("age", 31); // Output: "age changed to 31"
observable.set("address.city", "San Francisco"); // Output: "address.city changed to San Francisco"
observable.set(["address", "zipCode"], "94101"); // Output: "address.zipCode changed to 94101"

unsubscribe();