Better Dev Link

Fear of matrices? What do adding, substraction and multiply mean? We may know how to do these but what is their purpose? This article explains them from a geometry angle. Nice and fun to learn some math and clear myth about matrices.

Nowsday everything is on cloud and we no longer has to deal with building our own Linux kernel anymore. But it’s a fun excercise and you can learn a lot by bulding Linux from scrach. This repository is a docker image demonstrate how to build bootable ISO image.

A deep Git analysis. The author first pro-git, then learn Mercurial and become a Mercurial contributor. With the knowledge of both, the author discussed several problems of Git.

Kafka in a nut shell is a distributed commit log. Using Kafka isn’t hard but manage Kafka is a complicated task. This article talks about Kafka features like distributed, horizontal scale, fault tolerant.

A user encounters a JavaScript error. You’ll never guess what happens next!! Let’s setup a workflow allow us to capture the actions replay them. Full code is available on Github.

A depth guide on how to monitor Postgres. We learn what metrics to what and why we do that.

The post is about Java but they can apply to any OOP language such as Ruby, PHP, JavaScript.

Let’s hack the world’s most popular Wordpress CAPTCHA Plug-in. Real worlds, real example, real code.

Let’s learn some graphic progcessing. We may not use it a lot in our daily life but it’s very useful to know: basic discussion of how image dithering works, and how to write a general purpose dithering engine.

Images are still the number one cause of bloat on the web. Let’s find ways to optimize them and automate this process.

A service object is a simple PORO class (plain old ruby object) designed to wrap up complex business logic in your Rails application. We can then call these service to do thing instead of putting them in controller or model.