proms's Introduction

proms

A Very Simple Promise Simulator for Old Browsers

"Why should I use it ?!!"

Because it works in any javascript standards, and it does'nt matter that your code is executed in old browsers or the new ones.

"What does it support ?!!"

It can only understand then, catch, and finally.

"How can I test it ?"

Here is an example which you can compare native Promise with this package ((proms)) in node.js:

"use strict";

const fs = require("fs");
const proms = require("proms");

console.log("======================== Use The JavaScript Built-in Promise");
logDirListPromise()
    .then(msg => console.error(`1. ${msg}`))
    .then(msg => console.log(`2. ${msg}`))
    .catch(msg => console.error(msg))
    .then(() => {

        console.log("======================== Then Use This Package");
        logDirListProms()
            .then(msg => console.error(`1. ${msg}`))
            .then(msg => console.log(`2. ${msg}`))
            .catch(msg => console.error(msg))
            .finally(msg /*message of resolve or reject*/ => {
                console.log(`The .finally() msg is => ${msg}`);
            });

    });


function logDirListPromise(){

    return new Promise((resolve, reject) => {

        fs.readdir("./", (err, files) => {
            if(err)
                return reject(err);
            files.forEach(elem => console.log(elem));
            resolve("Hello");
        });

    });

}

function logDirListProms(){

    return new proms((resolve, reject) => {

        fs.readdir("./", (err, files) => {
            if(err)
                return reject(err);
            files.forEach(elem => console.log(elem));
            resolve("Hello");
        });

    });

}