inneroot

const returnPromeseAll = async () => {
  try{
    const a = getPromise1()
    const b = getPromise2()
    const concurrentResult = await Promise.all([a, b])
  }
  catch(err) {
    throw err
  }
  return concurrentResult

inneroot

const returnPromiseFromPromise = async (decree) => {
  return new Promise((resolve, reject) => {
    getPromise()
      .then(result => resolve(result))
      .catch(Error => reject(Error))
  })
}

inneroot

require('dotenv/config')
const mongoose = require('mongoose')
const Mymodel = require('./models/Mymodel')

mongoose.connect(
  process.env.MONGOCONNECT, 
  {useNewUrlParser: true, 
   useUnifiedTopology: true}, 
  () => console.log('connected to mongo')
)

inneroot

# app/controllers/registrations_controller.rb
class RegistrationsController < Devise::RegistrationsController

  before_action :one_user_registered?, only: [:new, :create]
  
  protected

  def one_user_registered?
    if User.count == 1
      if user_signed_in?

inneroot

//bootstrap 4 custom upload
//<input type="file" name="fileToUpload" id="fileToUpload" accept=".pdf" class="custom-file-input" onchange="getname(event)">
//<label class="custom-file-label file-upload-info" for="fileToUpload" id="upload_label">Upload PDF</label>

//uploaded filename > label, default label is back on clear;

let deflabel = "Upload File";
if (document.getElementById("upload_label")) deflabel = document.getElementById("upload_label").innerHTML;
function getname(evt){
	//console.log(evt);

inneroot

  <div class="field">
    <%= form.label :topmenuitem_id %>
    <%= form.collection_select(:topmenuitem_id, @menuitems.all, :id, :title) %>
  </div>

inneroot

var max_height = 0;
$("div.col").each(function(){
    if ($(this).height() > max_height) { max_height = $(this).height(); }
});
$("div.col").height(max_height);