Golang Golang How to implement Debounce and how to use time.Timer properly
timer.Timer is simple but it's not as straightforward to use it as it looks.What can we do with time.Timer?There are two...
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Golang 
Golang Golang Which way is the best to declare array/slice
Have you ever considered the best way to declare an array/slice in Golang? Golang offers several ways to declare it. It'...
Python Python How to add custom fields to logging formatter
logging module is a useful module for logging. The log format somehow needs to be defined to make it more readable. The ...
Golang Golang When should Atomic be used instead of Mutex?
I have used sync.atomic for the first time in my work. It's lighter than Mutex. If the program requires speed and it doe...
Docker Docker How to set up USB hotplug for a USB device
I needed to configure Docker container that can recognize a USB device. I used --device option for the first release. It...
JavaScript/TypeScript How to write clean if-else statements
if-else statements can easily be nested and make the code unreadable if we don't consider anything to write it. if-else ...
Python Python How to convert a nested JSON to a class
It's easy to convert an object to JSON and JSON to an object in Python. json module provides the following functions.dum...
Dart and Flutter Flutter Solve major problems related to TextField
TextField is often used for input in Flutter but we (at least I) run into a lot of problems to achieve what we want. I o...
Dart and Flutter Flutter Timestamp input by TextField
I posted the following article before to get Date and Timestamp.But sometimes it's better to have a simple UI. I wanted ...
Golang Golang Unit testing with Gomega matcher
A function result somehow needs to be compared in a unit test to know whether the function returns the expected value or...