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import React from "react";

const Box = ({ num }) => {
  const [state, setState] = React.useState(num);

  React.useEffect(() => {
    setState(num);
  }, [num]);

  return <div>child state ${state}</div>;

allenwei

import React from "react";

const Box = ({ num }) => {
    const [state, setState] = React.useState(num);

    return <div>child state ${state}</div>;
};

const App = () => {
    const [state, setState] = React.useState();

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require 'formula'

class Libstemmer < Formula
  # upstream is constantly changing the tarball,
  # so doing checksum verification here would require
  # constant, rapid updates to this formula.
  head 'http://snowball.tartarus.org/dist/libstemmer_c.tgz'
  homepage 'http://snowball.tartarus.org/'
end

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// Use Gists to store code you would like to remember later on
console.log(window); // log the "window" object to the console

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Pod::Spec.new do |s|
  s.name         = 'CocoaHTTPServer'
  s.version      = '2.2.1'
  s.license      = 'BSD'
  s.summary      = 'A small, lightweight, embeddable HTTP server for Mac OS X or iOS applications'
  s.homepage     = 'https://github.com/robbiehanson/CocoaHTTPServer'
  s.authors      = { 'Robbie Hanson' => 'cocoahttpserver@googlegroups.com' }
  s.source       = { :git => 'https://github.com/robbiehanson/CocoaHTTPServer.git', :tag => '2.2.1' }
  s.source_files = '{Core,Extensions}/**/*.{h,m}'
  s.clean_paths  = %w{Samples Vendor}

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Pod::Spec.new do |s|
  s.name     = 'RestKit'
  s.version  = '0.9.3'
  s.summary  = 'RestKit is a framework for consuming and modeling RESTful web resources on iOS and OS X.'
  s.homepage = 'http://www.restkit.org'
  s.author   = { 'Blake Watters' => 'blakewatters@gmail.com' }
  s.source   = { :git => 'https://github.com/RestKit/RestKit.git' }

  # It has no source_files itself, so the resolver should not allow dependencies on this spec unless it’s a `part_of' type dependency

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class User
   include UserModules::Invitation
end

module UserModules::Invitation
    extend ActiveSupport::Concern
    included do 
      validate :validate_invitation_code
      after_create :apply_invitation_code
      has_one :invitation, :class_name => "InvitationCode"

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class User
   include UserModules::Invitation
end

module UserModules::Invitation
    extend ActiveSupport::Concern
    included do 
      validate :validate_invitation_code
      after_create :apply_invitation_code
      has_one :invitation, :class_name => "InvitationCode"