Jumpin NPM | npm.io

Jumpin

An emitter-like way to distributively create and modify objects.

Install

$ npm install jumpin --save

Usage

const Jumpin = require('jumpin');
const emitter = new Jumpin();
const allPredicate = () => true;
const timePredicate = (data) => {
    return typeof data.time === 'number';
};

emitter.on(allPredicate, (obj) => {
    obj.time = Date.now();
    //returning true means that failed predicates will be reexamine
    //note: listeners that were invoked in this cycle won't get invoke again
    //returning false or undefined means that failed predicates might not get reexamined
    return true;
});

//async operation - will delay main pipeline
emitter.on(timePredicate, (obj) => {
    return new Promise((resolve) => {
        setTimeout(() => {
            obj.time = new Date(obj.time).toISOString();
            return resolve(false);
        }, 250);
    });
});

emitter.trigger({
        type: 'first-event'
    })
    .then((data) => {
        console.log(data.type); //log 'first-event'
        console.log(data.time); //log formatted date
    });