nnnikolay

Expanding on our previous article that covered Object-Oriented Analysis and Design (OOAD), today’s article will explore domain-driven design (DDD). DDD is a software development approach that uses and builds upon OOADprinciples and ideas, so it’s the next logical topic for us to dive into.

Throughout this article we’ll examine what domain-driven design is, how it is commonly implemented in modern development life cycles, and consider a few potential advantages and disadvantages of using DDD in your own projects. Let’s get crackin’!

What is the Domain? To define domain-driven design we should first establish what we mean by domain in this context (and in development in general). The common dictionary definition of domain is: “A sphere of knowledge or activity.” Drilling down a bit from that, domain in the realm of software engineering commonly refers to the subject area on which the application is intended to apply. In other words, during application development, the domain is the “sphere of knowledge and ac

nnnikolay

Requirements

You need to have installed brew on your laptop

Development

IDE

Install Visual Studio Code

nnnikolay

Given an MxN matrix represented by a 2D perimeter located in space and filled with stars, find the numbers of constellations.

Conditions:

The exact constellation structure to be found is the following:

0 * 0
* 0 *

If no constellation is found then the output should be 0 0.

nnnikolay

Someimtes it can be usefull to do banch of tasks in "parallel" and do not stop if some of them has been finished with the error

Promise.all([
  Promise.resolve(33).then((d) => { throw new Error(d)} ).catch(e => console.error('Inside ' + e)),
  Promise.resolve('test')
]).then(result => console.log(result)).catch(e => console.error(e));

In the output we will see

nnnikolay

files:
  "/opt/elasticbeanstalk/env.vars":
    mode: "000775"
    owner: root
    group: users
    content: |
      # enable extra logs
      set -xe

      # Defines variables for use by the other scripts below.

nnnikolay

files:
  "/tmp/deployment/nginx.conf":
    owner: root
    group: root
    mode: "000644"
    content: |
      user  nginx;
      load_module /usr/lib64/nginx/modules/ngx_http_perl_module.so;
      worker_processes  auto;

nnnikolay

<?php

function solution($S)
{
    $rules = [
        'AB' => 'AA',
        'BA' => 'AA',
        'CB' => 'CC',
        'BC' => 'CC',
        'AA' => 'A',

nnnikolay

<?php

function solution($S)
{
    $stack = [];

    foreach(parseCommand($S) as $command) {
        try {
            $stack = performOperation($command)($stack);
        } catch (Exception $e) {

nnnikolay

import stream from 'stream'
import https from 'https'

export default class googleServiceStream extends stream.Transform {
  /**
   * Initialize the stream
   */
  constructor() {
    super({objectMode: true})
  }

nnnikolay

const gulp = require('gulp'),
      sourcemaps = require('gulp-sourcemaps'),
      babel = require('gulp-babel'),
      symlink = require("gulp-sym"),
      eslint = require('gulp-eslint'),
      del = require('del'),
      install = require('gulp-install'),
      awsLambda = require('node-aws-lambda'),
      runSequence = require('run-sequence'),
      zip = require('gulp-zip'),