Aleksey-Danchin

function Watch (obj, scheme, handler, pathOriginal = [], _obj = {}) {
	scheme.forEach(fieldName => {
		const path = pathOriginal.map(e => e);
		if (typeof fieldName === 'string') {
			path.push(fieldName);
			if (['string', 'number', 'boolean'].indexOf(typeof obj[fieldName]) !== -1 || obj[fieldName] === null) {
				_obj[fieldName] = obj[fieldName];
				delete obj[fieldName];
				Object.defineProperty(obj, fieldName, {
					  enumerable: true

Aleksey-Danchin

let array = [1, 'b', 3, 'f', 'f', 'd', 'a', 9, 'b', 8, 'd', 4, 9, 'a', 5, 10, 3, 'c', 8, 7, 7, 6, 1, 'g', 'a', 'g', 4, 'e', 9, 8, 6, 5, 5, 2, 'c', 'd', 'e', 1, 6, 4, 2, 'b', 3, 10, 'e', 'f', 2, 'c', 10, 'g', 7];

array = array.filter((e, i, l) => i == l.lastIndexOf(e));

console.log(array); // => [ 'a', 9, 8, 5, 'd', 1, 6, 4, 'b', 3, 'e', 'f', 2, 'c', 10, 'g', 7 ]

Aleksey-Danchin

const object = {a: 1, b: 2};

Object.defineProperty(Object.prototype, Symbol.iterator, {
	  enumirable: false
	, configurable: true
	, get: () => function * () {
		for (const key of Object.keys(this))
			yield [key, this[key]];
	}
});

Aleksey-Danchin

Object.defineProperty(Array.prototype, 'first', {
	  enumerable: false
	, configurable: true
	, get: function () { return this[0]; }
	, set: function (value) {
		return this.length ? this[0] = value : this.push(value) && value;
	}
});

Object.defineProperty(Array.prototype, 'last', {

Aleksey-Danchin

const n = 1000;

const buff = new Int16Array(n + 1);
for (let i = 3; i < buff.length; i += 2) {
	buff[i - 1] = 1;
	
	if (buff[i] == 0)
		for (let j = i + i; j < buff.length; j += i)
			buff[j] = 1;
}

Aleksey-Danchin

class User {
	constructor (isAdmin = false) {
		const user = this;
		
		user.isAdmin = isAdmin;
		User.all.push(user);
	}
	static get admins () {
		return User.all.filter(user => user.isAdmin);
	}

Aleksey-Danchin

Object.defineProperty(Map.prototype, 'toJSON', {
	  enumerable: false
	, configurable: true
	, get: () => function () {
		const obj = {};
	
		for (const key of this.keys())
			obj[key] = this.get(key);
		
		return obj;

Aleksey-Danchin

Array.isEqual = function (...arrays) {
	if (arrays.length == 0) return false;
	if (arrays.length == 1) return true;

	const ctrl = arrays[0]
		, length = ctrl.length;

	for (let i = 1; i < arrays.length; i++) {
		const array = arrays[i];

Aleksey-Danchin

function showPerson1 (name, family, age) {
	console.log(name, family, age);
}

function showPerson2 ({name, family, age}) {
	showPerson1(name, family, age);
}

const name = 'Aleksey', family = 'Danchin', age = 24;

Aleksey-Danchin

class Point {
	constructor () {
		const point = this;
		
		point.x = 0;
		point.y = 0;
		point.color = 'red';
	}
	
	moveTo (x, y) {