Петр Мухуров

class Cupboard {
	constructor(props) {
		this._fromParent = { ...props };
    }

	delete() {
		console.log(this._fromParent);
    }

	refreshProps(props) {
		this._fromParent = { ...props }
    }

	//...
}

class Room {
	constructor() {
		this._number = 5;
		this._price = 500;
		this.cupboard = new Cupboard(this);
    }

	get number() {
		return this._number;
    }

	set number(value) {
		this._number = value;
		this.cupboard.refreshProps(this);
    }
}

const room = new Room();
room.cupboard.delete();
//{_number: 5, _price: 500}

room.number = 6
room.cupboard.delete()
//{_number: 6, _price: 500, cupboard: Cupboard}

const str = '<div class="abc"></div><div class="abc"></div><div class="abc"></div><div class="abc"></div><div class="abc"></div><div class="abc"></div><div class="abc"></div><div class="abc"></div><div class="abc"></div><div class="abc"></div>';

const result = str.split('</div>').reduce((prev, curr, index, arr) => { 
  if (index !== arr.length - 1) prev[index] = curr + '</div>'; 
  return prev; 
}, []);
// ["<div class="abc"></div>", "<div class="abc"></div>", "<div class="abc"></div>", "<div class="abc"></div>", "<div class="abc"></div>", "<div class="abc"></div>", "<div class="abc"></div>", "<div class="abc"></div>", "<div class="abc"></div>", "<div class="abc"></div>"]

var masterArray = ['1981', '2001,2002', '1991', '1985,1986,1987'];

let result = [];
compareArray.forEach((v, k) => { 
  let i = 0; 
  masterArray[k].split(',').forEach((vv, kk) => {
    v.split(',').indexOf(vv) !== -1 ? i++ : false
  }); 
  result.push(`${k} - [${i}]`) 
});
console.log(result);

const getList = (data) => {
  let res = [];
  const toList = ({serve, name, children}, index, prefix = '') => {
	  const id = prefix ? prefix + '.' + (index + 1) : (index + 1);
	  res.push({id: id, serve: serve, name: name});
	  children && children.length > 0 && children.forEach((v, k) => toList(v, k, id));
  }

  data.forEach((item, key) => {toList(item, key)});

  return res;
}

render() {
  return (
    <table>
      <tbody>
        {this.state.rows.map((row, i) => <tr key={i}>{row.map((cell, k) => <td key={k}>{cell.toString()}</td>)}</tr>))}
      </tbody>
    </table>
  )
}