Krivega

Задача №1
Ниже приведен пример создания dom-элемента div со вложенными ссылками:

const googleLink = document.createElement('a');

firstLink.innerText = 'google';
firstLink.href = 'http://www.google.com';

const facebookLink = document.createElement('a');

Krivega

import { adapterFactory } from 'webrtc-adapter/src/js/adapter_factory';
import JsSIP from '@krivega/jssip';

adapterFactory({ window });

const onUnloadPage = handler => {
  window.addEventListener('unload', handler);
};
const fetchSipIP = async serverUrl => {
  const response = await fetch(serverUrl);

Krivega

class Car {
  start(typeEngine) {
    const engine = this.createEngine(typeEngine);

    engine.start();
  }

  createEngine(typeEngine) {
    throw new Error('You have to implement the method createEngine!');
  }

Krivega

class Car {
  start(typeEngine) {
    const engine = this.createEngine(typeEngine);

    engine.start();
  }

  createEngine(typeEngine) {
    throw new Error('You have to implement the method createEngine!');
  }

Krivega

class Car {
  start(typeEngine) {
    let engine;

    if (typeEngine === 'Jet') {
      engine = new Jet();
    } else if (typeEngine === 'Gas') {
      engine = new Gas();
    } else {
      engine = new Brayton();

Krivega

const resolveEventHandler = parser => callback => event => {
  const value = parser(event);

  if (value !== undefined) {
    callback(value);
  }
};

const isValid = value => !!value;
const validateEventHandler = resolveEventHandler(value => {

Krivega

const resolveEventHandler = parser => (callback = noop) => event => {
  if (parser && callback !== noop) {
    const value = parser(event);

    if (value !== undefined) {
      callback(value);
    }
  } else {
    callback(event);
  }

Krivega

function withObserve(ClassRef) {
  return class extends ClassRef {
    #handlers = [];

    observe(handler) {
      this.#handlers.push(handler);
    }

    unobserve(handler) {
      this.#handlers = this.#handlers.filter(item => item !== handler);

Krivega

class ConnectInfo {
  #handlers = [];
  isConnected = false;

  observe(handler) {
    this.#handlers.push(handler);
  }

  unobserve(handler) {

Krivega

class CallAction {
  activate() {
    console.log('CallAction is active!');
  }

  deactivate() {
    console.log('CallAction is inactive!');
  }
}