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Array.prototype.diff = function(a) {
    return this.filter(function(i) {return a.indexOf(i) < 0;});
};

////////////////////  
// Examples  
////////////////////

[1,2,3,4,5,6].diff( [3,4,5] );  
// => [1, 2, 6]

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# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.

# dependencies
/node_modules
/.pnp
.pnp.js

# testing
/coverage

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import React from 'react';

class AddNewItemForm extends React.Component {
    constructor() {
        super();
    }

    state = {
        error: false,
        inputValue: ''

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class App extends React.Component {

    state = {
        todolists: [],
    };

    newTodoListId = 0;

    addTodoList = (title) => {
        let newTodoList = {id: this.newTodoListId, title: title};

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function greet(lang) {
  return langs[lang]||langs['english'];
}

var langs = {
'english': 'Welcome',
'czech': 'Vitejte',
'danish': 'Velkomst',
'dutch': 'Welkom',
'estonian': 'Tere tulemast',

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//Расширение объектных литералов

let name = "Alex"
let soname = "Zel"
let obj = {name, soname}
console.log(obj)

// Также можно создать метод

let fullName = function() {

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import sound from "./source/filename.mp3"

let audio = new Audio(sound);
audio.play();

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// Create interfaces for type

interface Urls {
  small: string;
  regular: string;
}

export interface PictureDate {
  id: string;
  urls: Urls;

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(change)="showOptions($event)"

showOptions(event:MatCheckboxChange): void {
    console.log(event.checked);
}

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// component for output data

import {Component, OnInit} from '@angular/core';
import {PictureDate, PictureService} from '../../services/picture.service';
import {StateService} from '../../services/state.service';


@Component({
  selector: 'app-home-page',
  templateUrl: './home-page.component.html',