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Creating case sensitive/insensitive volumes (https://www.dssw.co.uk/reference/diskutil.html)

# For case insensitive
diskutil apfs addVolume disk1 APFS <Volume name>
# For case sensitive
diskutil apfs addVolume disk1 "Case-sensitive APFS" <Volume name>

The newly created volume will be mounted to the /Volume/

EddiG

Was taken from https://github.com/kentcdodds/testing-workshop/tree/master/other/configuration/calculator.solution

package.json

{
  "babel": {
    "presets": "./.babelrc.js"
  }
}

EddiG

Running Elasticsearch on Amazon Machine Image (AMI)

1. Install the Elasticsearch following this instruction
2. Install Java sudo yum install java-1.8.0-openjdk
3. Choose the installed Java version sudo /usr/sbin/alternatives --config java
4. Install Amazon specific plugin sudo /usr/share/elasticsearch/bin/elasticsearch-plugin install discovery-ec2
5. Edit configurations in /etc/elasticsearch/
6. Run the Elasticsearch sudo -i service elasticsearch start
7. Look at the logs if didn't start /var/logs/elasticsearch/
8. Add to autostart on reboot sudo chkconfig elasticsearch on (for verifying sudo chkconfig --list)

EddiG

const DeleteItemMutation = ({ id, render }) => (
  <Mutation mutation={DELETE_ITEM_MUTATION}>
    {mutate =>
      render({
        deleteItem: id => {
          mutate({
            variables: { id },
            // optimisticResponse
 // update

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image = 'node:8.9.3'
container = 'my-project'
volume = 'my-project-volume'
site_port = '8080:8080'

build:
	docker run -it -d -v '$(CURDIR)':/app -v ${volume}:/app/node_modules -w /app -p $(site_port) --name $(container) $(image) /bin/bash
	docker exec -it $(container) yarn install

EddiG

Python 3

Discovery helpers

Getting a description about some of the classes or functions

help(tuple)
help(tuple.count)

Getting attributes of object

dir(tuple)

EddiG

How to use Docker

As Node.js powered development environment

Initialize new container with name my_project

docker run -it -d -v "$(PWD)":/app -v /app/node_modules -w /app -p 8080:8080 --name my_project node:8 /bin/bash

Notice how we mount new volume above node_modules folder. In this way, we significantly improve performance for host machines powered by OSX or Windows. Otherwise, we will stay with a poor native performance when the Docker synchronize file system state on host and container on npm install command execution.

EddiG

// fork.js
const { fork } = require('child_process');

const getMessage = () =>
  new Promise((resolve, reject) => {
    fork('src/child')
      .on('message', message => {
        resolve(message);
 })

EddiG

The example of how to render something only on client side

Inspired by facebook/react#10923 (comment)

class OnlyOnClient extends Component {
  static propTypes = {
    placeholder: PropTypes.node,
    html: PropTypes.string
  };

 state = {

EddiG

Polyfill for localStorage in Safari private browsing mode

Inspired by https://gist.github.com/juliocesar/926500

function getLocalStorage() {
  try {
    window.localStorage.setItem('__test-localstorage__', '1');
    window.localStorage.removeItem('__test-localstorage__');
    return window.localStorage;
  } catch (error) {
 const localStorage = {