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JavaScript/TypeScript

TypeScript – Using never type in switch case

TypeScript offers never data type for values that never occur. I've never seen it in my work but I found it useful for s...
Dart and Flutter

Flutter – Retaining current view state

When using PageView and moving to another page and coming back to the original page, its state is clear. I just wanted t...
Dart and Flutter

Flutter Set value from parent widget

I wanted to call a function from the parent widget to clear the current value of the child widget. To do that, we need t...
Dart and Flutter

Extended widget doesn’t solve a RenderFlex overflowed error

I faced RenderFlex overflowed error while I was implementing Flutter app. I could eventually solve the problem by using ...
Dart and Flutter

Flutter – How to add label to Divider widget

Flutter offers Divider widget but it is very simple one and doesn't offer label. To add label text we need to use Row wi...
JavaScript/TypeScript

Testing a function specified in callback that cannot be triggered in test

Don't you have a good idea to write a test of the logic specified in a callback function? Isn't it possible to control t...
Dart and Flutter

Dart – how to assign int/String values to enum

Dart supports only the simplest case on enum and its index always starts from 0. However, we often want to assign values...
Dart and Flutter

Dart – Understanding Class Initialization Order

I wrote simple code to understand class initialization order. Dart offers late keyword to check null at runtime instead ...
Dart and Flutter

Dart compiler doesn’t recognize if a variable is non-null value

Dart compiler doesn't recognize even though null check logic exists before using the variable. It took me a while to und...
JavaScript/TypeScript

How to Restrict Possible String Arguments

I want to limit the possible string arguments. How can I do it? This article is for you. I will show 4 ways to do it. Th...
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