Guru on Rails

if you don’t sacrifice for your dream then your dream becomes your sacrifice.
Will Nguyen

Mon 24 Dec 2018

Software Architecture Best Practices Performance

Rabbitmq and Sneakers would bring to us a ton of benefits. That is one of many solution for improving performance by placing synchronous work into a background work asynchronously. However, we can ...

Tue 18 Dec 2018

Design Patterns

factory_bot.rb require 'set' require 'active_support/core_ext/module/delegation' require 'active_support/deprecation' require 'active_support/notifications' require 'factory_bot/definition_hierarc...

Thu 01 Nov 2018

Problem Solving

I'm sitting here at Trung Nguyen coffeeshop in Vietnam near the Airport. I'm solving a problem for traversing tree. Some ideas just came up, I really want to write it down. We are totally wrong abo...

Wed 24 Oct 2018

Data Structures

You might know, algorithm almost needs data structure. Any data structure is born with at least one reason. What problems does it solve? Speaking of hash table, it's efficient for complex structure...

Tue 23 Oct 2018


Transactions move value from transaction inputs to transaction outputs. An input is a reference to a previous transaction's output, showing where the value is coming from. An output is a specific ...

Sat 20 Oct 2018

Problem Solving

Problem solving is the essential skill. So what is the good way to improve this skill? So many developers with good problem solving skill tell us that we need to train this one on daily basic. Howe...

Fri 19 Oct 2018

Blockchain Security

We use digital signature a lot nowaday. In order to understand the blockchain technology - it's more likely the design pattern, we have to understand the digital signature. How does it work? Which ...

Wed 17 Oct 2018


In this article, I introduce some modern syntaxes of JavaScript. If you are backend developer, you need to know these things if you want to get into MERN Stack. Variable: let & const Read how t...

Wed 17 Oct 2018

Javascript Automated testing MERN Stack

If we are ruby on rails developer, it's pretty cool. Why did I say that? Because as we know, we use Rspec for testing for rails application. And now I'm going to introduce to you the same way of te...

Sun 14 Oct 2018

Javascript MERN Stack

Redis is a database which stores data in RAM so it's pretty fast. However, if server restarted, we will lose data. We use it in cases that we need the speed, storing the data structure in RAM inste...

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