Steps to deploy a Node.js app to DigitalOcean using PM2, NGINX as a reverse proxy and an SSL from LetsEncrypt
If you use the referal link below, you get $10 free (1 or 2 months) https://m.do.co/c/5424d440c63a
I will be using the root user, but would suggest creating a new user
| import { useState, useRef, useEffect, useCallback } from 'react'; | |
| // Usage | |
| function App(){ | |
| // State for storing mouse coordinates | |
| const [coords, setCoords] = useState({ x: 0, y: 0 }); | |
| // Event handler utilizing useCallback ... | |
| // ... so that reference never changes. | |
| const handler = useCallback( |
| // 🔥 Node 7.6 has async/await! Here is a quick run down on how async/await works | |
| const axios = require('axios'); // promised based requests - like fetch() | |
| function getCoffee() { | |
| return new Promise(resolve => { | |
| setTimeout(() => resolve('☕'), 2000); // it takes 2 seconds to make coffee | |
| }); | |
| } |
| // check version | |
| node -v || node --version | |
| // list locally installed versions of node | |
| nvm ls | |
| // list remove available versions of node | |
| nvm ls-remote | |
| // install specific version of node |
A complete list of RxJS 5 operators with easy to understand explanations and runnable examples.
A quick guide on how to setup Node.js development environment.
nvm allows installing several versions of Node.js to the same system. Sometimes applications require a certain versions of Node.js to work. Having the flexibility of using specific versions can help.
| import UIKit | |
| extension UIImage { | |
| // colorize image with given tint color | |
| // this is similar to Photoshop's "Color" layer blend mode | |
| // this is perfect for non-greyscale source images, and images that have both highlights and shadows that should be preserved | |
| // white will stay white and black will stay black as the lightness of the image is preserved | |
| func tint(tintColor: UIColor) -> UIImage { | |
Hi Nicholas,
I saw you tweet about JSX yesterday. It seemed like the discussion devolved pretty quickly but I wanted to share our experience over the last year. I understand your concerns. I've made similar remarks about JSX. When we started using it Planning Center, I led the charge to write React without it. I don't imagine I'd have much to say that you haven't considered but, if it's helpful, here's a pattern that changed my opinion:
The idea that "React is the V in MVC" is disingenuous. It's a good pitch but, for many of us, it feels like in invitation to repeat our history of coupled views. In practice, React is the V and the C. Dan Abramov describes the division as Smart and Dumb Components. At our office, we call them stateless and container components (view-controllers if we're Flux). The idea is pretty simple: components can't