SirSerje

import mongoose from 'mongoose';
import dotenv from 'dotenv';
import { Readable } from 'stream'

let bucket;

const envConfig = dotenv.config();
if (envConfig.error) {
  console.log('.env file does not loaded');
  throw envConfig.error;

SirSerje

import React from 'react';
import './App.css';
import './index.css'

function App() {
  return (
    <div className="App">
      <Parent/>
    </div>
  );

SirSerje

const AddWelcome = (GreetingComponent) => {
  class TheNewComponent extends Component {
    render() {
      return (
        <div>
          <GreetingComponent {…this.props}/>
          <p>Welcome to React!</p>
        </div>);
      }
    }

SirSerje

const trace=label=>value=>{
  console.log(`${ label }: ${ value }`);
  return value;
};
const simpleTrace = value => console.log(value);

const pipe = (...fns) => (args) => fns.reduce((arg, fn) => fn(arg), args);
const compose = (...fns) => (args) => fns.reduce((arg, fn) => fn(arg), args);
const mult = a => b => a*b;
const add = (a) => (b) => a+b;

SirSerje

//функция, которая формирует тему
const makeStyle = theme => ({
  background: theme.mainColor,
})

//Сам ХОК
const WithStyle = styleParam => (WrappedComponent) => {
  return class withStyleHOC extends React.Component {
    render() {
      const myProps = { someProp: 123 };

SirSerje

const highOrderComponent = (WrappedComponent) => {
  class HOC extends React.Component {
    render() {
      return <WrappedComponent/>;
    }
  }
  HOC.displayName = `HOC of ${WrappedComponent.displayName || WrappedComponent.name || 'Component'}`;
  return HOC;
};

SirSerje

import React from 'react';

const withStorage = (WrappedComponent) => {
  class HOC extends React.Component {
    state = {
      localStorageAvailable: false, 
    };
  
    componentDidMount() {
       this.checkLocalStorageExists();

SirSerje

kill all running containers with docker kill $(docker ps -q)
delete all stopped containers with docker rm $(docker ps -a -q)
delete all images with docker rmi $(docker images -q)

SirSerje

function Animal(name) {
  this.name = name
}

Animal.prototype.getName = function() {
  return this.name
}


function Dog(name) {

SirSerje

function getUniqueObject(nonUniqueArray) {
    let result = [];
    for (let i = 0; i < nonUniqueArray.length; i++) {
        let currentItem = nonUniqueArray[i];

        if (isObjectPresent(result, currentItem)) {
            console.log('object is similar')
        } else {
            result.push(currentItem)
        }