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Hash table is a data structure that stores data in key-value pairs. It is also named as a dictionary or associative array. It stores data in a way that enables lookup and insertion in constant O(1) time. These properties of a hash make it one of the most useful data structures in a programmer's toolbox. The main question is where does this speed come from and how does it work?
Web development is a long and storied process. From the Internet's humblest of beginnings in the 1960s as a US Department of Defense project to its existence today as the ultimate communications tool, web developers have been there every step of the way, innovating and thinking up new and interesting ways to apply technology to our lives.
In the previous articles of the series we decided on the required playground functionality and prepared a [runtime infrastructure for game bots and sandboxes](https://anadea.info/blog/it-duel-2017-implementation-part2-digital-ocean-droplets-and-dokku-setup). It's time to actually program the game engine.
Programmers strive to write simple and understandable code. The less code is written, the less likely it is that there is an error in it. Scala offers the ability to write even more concise code and rely on the help of the compiler.
The evolution of artificial intelligence is now in full swing and chatbots are only a faint splash on a huge wave of progress. Today the number of users of messaging apps like WhatsApp, Slack, Skype and their analogs is skyrocketing, Facebook Messenger alone has more than 1.2 billion monthly users. With the spread of messengers, virtual chatterbots are becoming increasingly in demand.
Rspec is an awesome thing that was created for ruby community. Most of us write tests. However, sometimes in large projects our test becomes really slow. So, each launch of the test really hurts and it does not meter whether you launch your test before commit/push or on CI. When your test suits pass over 30 minutes - something definitely went wrong.
Sometimes, when you are working with a large codebase, your `routes.rb` files grow really fast and become very dirty.There are several things that make your routes file bigger:* Customization of devise;* Specific gems that mount additional routes (Active Admin, ActionCable);* Sidekiq + SidekiqWeb + Basic authentication;* Namespaces with APP or API.
Сarrierwave is a popular image upload gem used by the Rails community to upload files to the server.Recently I had a task to upload two types of images into the application. Under the hood,the only difference between them was the target directory on the server. Sounds pretty simple, right?
In the world of front-end development, things are a bit complicated. New frameworks appear all the time, which provides both opportunities and challenges for developers. The situation has become better in the past few years but it's still confusing. Polymer, Aurelia, Sencha, Webix and so on - what's behind all those names? How and when should you use them?
Online advertising has turned into something trivial for us. We receive advertisements by email, see them on YouTube, social networks, online shops, etc. We take internet ads as they are and just notice the things that they try to sell us. However, have you ever wondered what mechanism drives online advertisements and how does digital advertising work?
Evolution never stops. All things come into the world, grow and fade away in the end, letting other things take their place - that's the circle of life. Being a part of life, web browsers can't escape the same fate. It's time for them to grow and evolve. Today we'll look at WebAssembly. It's a pretty interesting technology that can take web browsers to a new level.
We can't imagine our lives without gadgets and every month there appear more and more smart devices, useful applications and innovative services. None of them would be possible without great ideas and participation of professionals who can and love to code. The advancement of technologies and custom software development opened up a lot of doors and made many unimaginable things real.
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