My first time using Go

After following the straightforward installation guide from this page:

I wrote my first go program this morning. Executing the go build command will build the hello.go and produce the following binary file named with go. I was confused, why there is a new file created named with go, but after I executed the binary file I finally able to see the output in the console.

hello, world

I explored a bit the go build command and I think I can do better by naming the build output file using the -o option.

go build -o hello

So, the binary file will be named to hello instead of go. This is content inside of the binary file.

It's magic, oops, I mean machine code

It’s magic, oops, I mean machine code

Learning Flexbox through free Scrimba Course


The most important concepts you need to understand about Flexbox is the Flex Container and Flex Items.

Main Axis and cross Axis

Flexbox container always have direction and by default the direction is from horizontal (left to right). We can change this direction behavior by specifying the CSS property of flex-direction to column if we want to layout the elements inside the Flexbox container from top to bottom.


Justify Content

By default the flexbox container will layout the elements at the start (or left aligned). We can change this behavior by specifying the justify-content to either flex-start, flex-end, center, space-around, space-evenly, or space-between.

I got questions related to this course module:

  • Is it possible to combine the justify-content values for example combining the flex-start with space-around?

The Flex Property

By default the elements inside the flexbox container will have the width fit with the content inside of the element (text or another element). If we want to set the elements to have equal width, set the value of flex to 1 or any other value greater than 1 it will still set the equal width to the elements.

Align Items

Aligning items vertically can be done using the align-items property. If we combined the align-items: center and justify-content: center then we can layout the elements vertically and horizontally relative to the container.

Screenshot from 2018-07-05 22-19-58

Note the the align-items should set in the container.

If we want to align one element inside the container, then we can use align-self property in the element to do that.

Flex Wrap

By default Flexbox won’t allow the elements inside the container to be wrapped. If we want to push down elements inside the container when the parent width no longer has enough space, set the value of flex-wrap to wrap.

Grow Shrink Basis

The flex: 1 is actually a shorthand of the following rules:

  • flex: 1 1 0
  • flex-grow: 1; flex-shrink: 1; flex-basis: 0;

It’s my first time using MobX

There is a job that required me to use MobX, and never use it before, but I’ve heard a lot of it from friends at Twitter-land. My first thought about this tool is it would be less simple than Redux. After getting my self into MobX 101, I started to think MobX is simpler than Redux.

I only scratched at the tip of the iceberg, so there is more I need to learn from both tools. Beyond that, I made a little contribution to the MobX documentation.

Here is the example I tried:

codesandbox: timer using mobx

See what ports are open on my machine

In order to see what ports are open on my machine, I prefer to use this netstat to get the job done:

netstat -ntlp | grep LISTEN

If I want to list the ports with more details (e.g. PID and the program name), I need to run the command as a root:

sudo netstat -ntlp | grep LISTEN