Promise Queue Pool

Install

``npm install --save promise-pool2`

Docs

- constructor(capacity) - accepts capacity the maximum number of promises that can be executed at every moment

- .add(fn) - accepts function with no arguments, which returns promise object that must be executed later. add method returns new Promise which will be resolved/rejected later

Usage

`js
const PromisePool = require('promise-pool2');
const pool = new PromisePool(3); // maximum 3 promises can be executed at every moment

Promise.all([
pool.add(_ => wait(100, 'Hello!')).then(print),
pool.add(_ => wait(100, 'This')).then(print),
pool.add(_ => wait(100, 'is')).then(print),
pool.add(_ => wait(100, 'a')).then(print),
pool.add(_ => wait(100, 'simple')).then(print),
pool.add(_ => wait(100, 'demo')).then(print),
pool.add(_ => wait(100, 'of')).then(print),
pool.add(_ => wait(100, 'promise-pool2')).then(print)
])
.then(messages => {
console.log(messages.join(' '));
});

function wait (delay, txt) {
return new Promise((resolve, reject) => {
setTimeout(_ => {
resolve(txt);
}, delay);
});
}

function print (txt) {
console.log(txt);
return txt;
}
``