ActiveJS' reactivity is based on RxJS Observable, hence, you can take full advantage of RxJS operators.
- Observable value
- Reactive value mutation
- Optionally Immutable
- Optionally Persistent
These Units help you share data among different parts of an app with minimum code and effort. Furthermore, ActiveJS helps in streamlining asynchronous data APIs like
fetch, or third party abstractions like Angular's
If you don't have RxJS installed already, you'll need to install it first
npm install rxjs, and then
npm i @activejs/core
// initialize a reactive data structure to store numbers
const counter = new NumUnit() // with default initial-value 0
// two pure functions to produce an appropriate new value
const increment = value => value + 1
const decrement = value => value - 1
// subscribe for reactive value access, and log the value
counter.subscribe(value => console.log(value))
// immediately logs 0, and will log any future values
counter.dispatch(increment); // you'll see 1 in the console
// the pure function is called with the current value and
// the returned value is dispatched automatically
counter.dispatch(decrement); // you'll see 0 in the console
// that's it our counter is complete
// you can also access the value directly
console.log(counter.value()) // logs 0
You never have to worry if the value of this counter is
numberor not, the NumUnit will ensure that it's a
number, it'll ignore any non-
numbervalue dispatch. We'll talk about it in detail later.
A "counter" implemented in vanilla Redux vs ActiveJS. It's not a fair comparison because a NumUnit can do so much more alone, and Redux is powerful in its own way. But it is what it is.
Redux vs ActiveJS
It's hard to Compare with NgRx without involving Angular, but for argument's sake let's pretend that this stripped-down code is valid.
NgRx vs ActiveJS
The following data-flow diagram roughly shows where ActiveJS comes into play. ActiveJS holds the state and every other part of the application directly shares it without any obscure façade.
A very high level data-flow diagram of an App using ActiveJS.
ActiveJS is really small in size, and it's tree-shakeable too. Also, there're no reducers, no middleware, and not even a store for that matter. It's much simpler than that.