There are two ways to install Golang in Ubuntu. But to install the latest one, I highly recommend to download the binary file from the official go website.

golang website downloadDownload Golang binary file$ sudo wgetExtract the files from the downloaded tar file.$ sudo tar xvzf go1.15.6.linux ...

React Native

Case1. Save an Image File on Local Filesystem

Because Image file is temporary saved on tmp directory just after it is picked by Image picker, the image file should be re-saved on the local filesystem permanently.

In this example, the variable “image” has a temporary file path, an ...

Visual Studio Code

What is “Prettier”

Prettier is a code formatter and can work on Visual Studio Code as an extension.

By using this tool, your code is automatically formatted when you save it.

How to install Prettier on VSCode.

You can install it on > > .

Search “Prettier& ...

Visual Studio Code

Adjust Indent

You can adjust indents manually with Alt + Shift + F keys.

But if you don’t want to type them every time, I recommend the auto indent feature.

Move to >>. Then, Enter “formaton”. You can see the following setting items.

Check the each items.

Ope ...

Development,React Native

If you haven’t read “Which is Better? ExpoCLI Tool or React Native CLI“, please visit this post at first.

Start Expo CLI Tool

After Install, start Expo CLI with the “npm start” command.


npm start>@ start C:\test-project>expo startStarting proje ...

Development,React Native

Expo CLI Tool

Expo is a third-party service. It removes a lot of complexity, and provides lots of convenience & utility features.


In other words, It is a thin extra layer between your app and the vanilla React Native.

For detail, you can find the first step here “

Rea ...