AngReload

const treeFieldsByType = {
  obj_tree: 'obj_tree',
  obj_feature_tree: 'obj_feature_tree',
  regexp_tree: 'regexp_tree',
};
  trees.map((tree) => {
    const fieldName = treeFieldsByType[tree.tree_type];
    if (item.id === tree[fieldName].parrent_element) {
      tree[fieldName].parrent_element = newId;
    }
  });

for (key in object1) {
  if (object1.hasOwnProperty(key) && object2.hasOwnProperty(key))
    object1[key] = object2[key]
}

"react": "^16.4.0",

import React, { Component, PropTypes } from 'react';

Note:
React.PropTypes has moved into a different package since React v15.5. Please use the prop-types library instead.

const fs = require('fs');
const dir = './directory';

fs.readdir(dir, (err, files) => {
  console.log(files.length);
});

/**
 * Рандомизация с сидированием
 * @param {number} seed - сид значение
 * @return {number/boolean} - случайное значение из переданного сид значения
**/
function Random(seed) {
	this.number = function(min, max, fixed) {
		if (!fixed) fixed = 'floor';
		max = max || 1;
		min = min || 0;
		seed = (seed * 9301 + 49297) % 233280;
		var rnd = seed / 233280;
		switch(fixed.toLowerCase()) {
			case 'floor': {
				return Math.floor(min + rnd * (max - min));
			}
			case 'float': {
				return min + rnd * (max - min);
			}
		}
	},
	this.boolean = function(rate) {
		if (!rate) rate = 50;
		seed++;
		return Math.sin(seed) <= rate / 100;
	}
}

var rand = new Random(62086296325); //> seed
rand.number(1, 5, 'floor'); //> 2 (у всех пользователей)