Added Apple wireless keyboard to my iPad

#TIL that i could use the Apple wireless keyboard on my iPad, which will change how I use my iPad dramatically, I believe.

Anyhow I haven’t blogged much lately (since last year) ’cause I was very busy with projects at my work place. I’ve been doing something related to private cloud infrastructure for the organization. What I can say is it involves OpenStack, Netflix’s Asgard.

BTW there was a news article about Walmart going with OpenStack that powers around 100,000 nodes.

build pipeline plugin first pull request

At my work, we have been using build pipeline jenkins plugin. However, there was a bug with it in our use case, which I have filed a bug for it.

There’s reproduce steps in the bug, but the issue is that parameter values from a wrong upstream job are passed to manually triggered downstream job if the downstream job is shared by a few/many different upstream jobs. Auto deploy downstream jobs do not have the same issue. It’s affected by only manual downstream job.

So I made an update to build pipeline plugin and made a pull request for the first time in my github history. This is the actual difference.

Simple way to convert NodeList into Array in javascript

So what is going on with the above statement? Here’s what’s going on:

  1. getElementsByTagName does not return Array object. Instead it returns NodeList (You can easily test it out on the developer tools. i.e. document.getElementsByTagName(‘li’).constructor)
  2. NodeList does not have array methods. Prototype type chain is not connecting to array prototype at all. (NodeList.prototype.__proto__.constructor == Object)
  3. slice returns a new array object so using slice against NodeList converts NodeList into Array

quick note on “use strict”

I just want to make a quick note on “use strict” in javascript.


  1. won’t allow to create a global variables
  2. Illegal assignment throws an exception
  3. attempt to delete undeletable properties throws an exception
  4. all named properties must be unique
  5. function parameter names must be unique
  6. octal syntax is not permitted

computer science fundamentals for one with no computer science background

I’m working as software engineer with broad range of technology stacks. Frontend and backend and sys admin and so on. It’s because I love to learn something new.

It’s funny how my career has come this way. My major during college was Mass Communication and then later I changed it to Graphics Design. Back then I loved visual effects using 3d and was fascinated with digital artists’ work. I had a few chances to learn multimedia authoring tool and web development tool such as Macromedia Director and designing web site. Naturally I wanted to learn “Lingo” language while learning Macromedia Director and HTML/CSS while learning website design.

By the time I had a final test, I was able to make a simple game using Macromedia Director on top of the main course of the class. Same to HTML/CSS on top of website design. My attraction had started shifting to interaction from static design.

Flash 4 and 5 were the web when it was the most popular thing in web development community. I was so into them as well. So I started learning a lot of them myself again like the way I learned Lingo and HTML/CSS during college. And I got pretty good at them and that’s when my programer life has started.

Basically I’m a programer who does not have computer science degree. However, I tried to learn CS knowledges as much as possible by myself. Simply because I wanted to know more about programming, algorithms, techniques, and so on. Also I wanted to become a better programmer. At one point I wanted to go back to school and get a CS master degree, but having a full time job as a programmer and a family hasn’t helped me much.

So far I’ve learned Big-O, sorting algorithms, map/reduce, hashtables, numbering system. When I have more chances, I am planning to go at Tree, Graphs, Data structures, Discrete math whenever I have time.

These are topics that eventually I want to cover basically:

  • Sorting (bubble, quick, insertion, merge, selection)
  • Data Structure (NP-complete)
  • Searching
  • Trees
  • Graph
  • Path Finding (A* & Dijkstra)
  • Mathematics

Maybe I missed something, but I hope to know all of topics really well soon. 🙂