JavaScript/TypeScript How to check if an object implements an interface in Typescript
When using Typescript the compiler detects the type error. It supports any data type but it is not recommended to use be...
JavaScript/TypeScript 
JavaScript/TypeScript How to write Node-RED flow test
Testing the whole Node-RED flow is important but adding test flows is not a good idea. Test stuff should exist only in the test code. This post explains how to write Node-RED flow tests in JavaScript/TypeScript code.
JavaScript/TypeScript Replacing a static function by using proxy class
This is 4th post in Become a better and decent programmer series.In the first post, I explained how to extract logic in ...
JavaScript/TypeScript Reducing number of conditional clauses by command pattern
This is 3rd post in Become a better and decent programmer series.In the first post, I explained how to extract logic in ...
JavaScript/TypeScript How to make code testable
In this post, we created a shopping application which is available on console and refactored it. It has only one class w...
JavaScript/TypeScript How to become a better programmer
I hadn't been decent programmer for a long time because I hadn't written unit test. Decent programmer should at least be...
Docker Visualizing log info with Fluentd, Elasticsearch and Kibana
Docker writes contents written to stdout and stderr into json formatted log file. If we create a function to write log w...
Docker Container optimization
As you already may know, Docker doesn't automatically remove images. An image composes of layers that are cached and the...
Docker Update and rollback without downtime in swarm mode
We don't want to stop our services when updating one of Docker images in a cluster if possible. If the new image fails t...
Docker Creating a cluster with Docker swarm and handling secrets
Docker Swarm is Native orchestration tool. It makes service management easy. For example, it stops a container which is ...