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  Loading images progressively using Gaussian blur

The popular online publishing platform Medium has adopted an impressive image loading mechanism -- pure color - blur image loading - real image loading. Since images on Medium usually have high definition, it takes much time to load an image and hence brings a bad user experience if rendering the image after it's completely downloaded. The solution Medium comes out is to preload an small image when the real image is being loaded.  On Medium, the HTML code will have below pattern ...

   JAVASCRIPT,ALGORITHM,GAUSSIAN BLUR,MEDIUM,BLUR IMAGE     2016-09-25 03:33:00

  Don't write on the whiteboard

I recently interviewed at a major technology company. I won't mention the name because, honestly, I can't remember whether I signed an NDA, much less how strong it was.I did well. Mostly because of luck. I normally step over myself when I interview. I guess I've improved over the years. Here are a few tips to ace your own interview.1. Don't write on the whiteboardWhen I interviewed at Palantir around 5 years ago, I had a lot of trouble with this. Yes, I knew next to nothing about compu...

   Interview,Preparation,Whiteboard,Note,Python     2012-01-11 11:31:32

  Different types of keystore in Java -- BKS

BKS is a keystore format provided by the popular third party Java cryptographic library provider -- BouncyCastle. It is a keystore similar to the JKS provided by Oracle JDK.  Before starting to use BKS, the BouncyCastle provider has to be downloaded and installed. To download the provider, please go to BouncyCastle download page. The provider can be installed by adding an entry in the java.security file. security.provider.N=org.bouncycastle.jce.provider.BouncyCastleProvider N means the pr...

   JAVA,KEYSTORE,BOUNCYCASTLE,BKS     2016-07-03 03:00:18

  Penrose Tiling in Obfuscated Python

Here’s a Python script which renders some Penrose tiling. Yes, this is valid Python code: _ =\ """if! 1:"e,V=100 0,(0j-1)**-.2; v,S=.5/ V.real, [(0,0,4 *e,4*e* V)];w=1 -v"def! E(T,A, B,C):P ,Q,R=B*w+ A*v,B*w+C ...

   Python,Disorder,Code,Writing,Style     2011-09-14 11:57:34

  How to improve website rank in search engine?

Want to let people know your website? Want to get much web traffic ? Then you need to make sure that people can find your website. Currently, many people are using search engine to find what they are interested in. So besides good content, you need to spend some time on getting your website shown at the first few pages of the search engine. Here are 10 suggestions to improve your website rank in search engine.1. Webpage response speedSimilar to human beings, search engine hates waiting. Webpage ...

   Website rank,Suggestions,SEO     2012-07-23 13:28:27

  What I learned interviewing with Google

Over the last few weeks I’ve been interviewing with Google for a job doing primarily JavaScript development. I didn’t end up getting the job but I thought I would share the process of interviewing for Google as it was both very exciting and a humbling experience. I can’t reveal everything as I’m under a few NDAs. I’m not going to mention the products or teams that I was interviewing for but you may be able to guess. For those that don’t know me, IÃ...

   Google,Experience,Interview,Algorithm     2012-02-10 06:19:17

  TL;DR: Beyond Mobile

In his Beyond Mobile presentation at TL;DR Conference in San Francisco CA, Scott Jenson made the case for moving beyond mobile applications and illustrated what a future without apps could be. Here’s my notes from his talk: The history of mobile phones has been copying the desktop and then realizing it just doesn’t work right.Apps are a holdover from the desktop.There are a number of trends that highlight how we can move beyond apps on mobile.App Glut: are we going to have an a...

   Mobile,Beyond mobile     2012-04-01 04:20:30

  Using C for a specialized data store

Pixenomics stores and transports 1.2 million pixels from the server to the client. During development we played with various methods to store and process this. Our ultimate goal was to send the entire board in under 1 second. During the stages of prototyping we used a MySQL database without thinking too much about performance. With a mere 2,000 pixels we quickly realised this wasn’t even usable as a demo. Changing the storage engine to memory was much better but still obviously unu...

   C,Data store,Efficiency,Performance     2012-03-07 05:09:38

  Books for entry level C programmers

In computing, C is a general-purpose programming language initially developed by Dennis Ritchie between 1969 and 1973 at Bell Labs Its design provides constructs that map efficiently to typical machine instructions, and therefore it found lasting use in applications that had formerly been coded in assembly language, most notably system software like the Unix computer operating system.To learn C, we need to read many C books and have many practices. Here we summarize a list of C books which may h...

   C,Book,Beginning     2012-07-26 14:00:51

  Python Patterns - An Optimization Anecdote

The other day, a friend asked me a seemingly simple question: what's the best way to convert a list of integers into a string, presuming that the integers are ASCII values. For instance, the list [97, 98, 99] should be converted to the string 'abc'. Let's assume we want to write a function to do this. The first version I came up with was totally straightforward: def f1(list): string = "" for item in list: string = string + chr(item) return string ...

   Python,Optimization,Anecdote,Loopup,ASCII     2011-12-18 10:52:49

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