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ITEM_AGED_BRIE = "Aged Brie".freeze
ITEM_BACKSTAGE_PASS = "Backstage passes to a TAFKAL80ETC concert".freeze
ITEM_SULFURAS = "Sulfuras, Hand of Ragnaros".freeze

class GildedRose
  def initialize(items)
    @items = items
  end

  def update_quality()

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# Sets up basic development environment for ruby and nodejs

# Install Homebrew
ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

# Install Homebrew basics
brew install adns apr apr-util archey aspell atk augeas autoconf automake aws-cfn-tools aws-elasticbeanstalk awscli boost cairo certbot clamav cmake convox coreutils dialog dos2unix doxygen ec2-api-tools elasticsearch erlang faac ffmpeg flow fontconfig freetds freetype gcc gd gdbm gettext gifsicle git glew glib gmp gnupg gnupg2 gnutls go gobject-introspection gource graphviz heroku htop htop-osx hub icu4c imagemagick isl jhead jpeg jpegoptim lame libassuan libevent libffi libgcrypt libgpg-error libidn2 libksba libmpc libpng libpq libtasn1 libtiff libtool libunistring libusb libusb-compat libvo-aacenc libxml2 libyaml libzip mcrypt memcached mhash mpfr mysql nettle node npth nvm openssl optipng overmind p11-kit pcre pgcli phantomjs php pinentry pinentry-mac pixman pkg-config prettyping pth python python3 python@2 qt r

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// Basic example of useState.

import React, { useState } from 'react';

export default function Greeting(props) {
  const [name, setName] = useState('Mary');

  function handleNameChange(e) {
    setName(e.target.value);
  }

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// Typescript definitions for React hooks
// Take with a grain of salt; these are a first attempt and I've only actually
// used a few so far :)

import { Context, RefObject } from 'react';

declare module 'react' {
  export function useState<T>(initialValue: T): [T, (newState: T) => void];
  export function useEffect(effect: Function, inputs?: Array<any>): void;
  export function useMutationEffect(effect: Function, inputs?: Array<any>): void;

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Under the hood, adding a string to an array invokes type coercion -- the Array's toString() method is called, which in turn calls join()

join() is specified not to check for key presence, and returns the empty string if the value is undefined

https://www.ecma-international.org/ecma-262/6.0/#sec-array.prototype.join

> Array(3).join(',')

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import React            from 'react';
import classNames       from 'classnames';
import { Input }        from 'react-bootstrap';
import MaskedInputField from 'react-maskedinput';

export default class MaskedInput extends Input {
  renderInput() {
    const className = this.isCheckboxOrRadio() || this.isFile() ? '' : 'form-control';
    return <MaskedInputField {...this.props} className={classNames(this.props.className, className)} ref="input" key="input" />;
  }