staltz

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

---

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

---

obolton

AWS ELB with Node.js and WebSockets

This assumes that:

• You are using Nginx.
• You want to accept incoming connections on port 80.
• Your Node.js app is listening on port 3000.
• You want to be able to connect to your Node.js instance directly as well as via the load balancer.

####1. Create load balancer

rxgx

const AWS = require('aws-sdk');

const client = new AWS.SecretsManager({});

// Call the AWS API and return a Promise
function getAwsSecret(secretName) {
  return client.getSecretValue({ SecretId: secretName }).promise();
}

// Create a async function to use the Promise

sekoyo

import { useRef, useCallback, useEffect, useState } from 'react';
import { ResizeObserver as ResizeObserverPolyfill } from '@juggle/resize-observer';

const ResizeObserver = window.ResizeObserver || ResizeObserverPolyfill;

export default function useResizeObserver() {
  const [size, setSize] = useState({ width: 0, height: 0 });
  const resizeObserver = useRef(null);

  const onResize = useCallback(entries => {