Programming

Storing hundreds of millions of simple key-value pairs in Redis

When transitioning systems, sometimes you have to build a little scaffolding. At Instagram, we recently had to do just that: for legacy reasons, we need to keep around a mapping of about 300 million photos back to the…

Learn to speak vim — verbs, nouns, and modifiers!

Using vim is like talking to your editor in ‘verb modifier object’ sentences, turned into acronyms

• learn some verbs: v (visual), c (change), d (delete), y (yank/copy). these are the most important. there are others

Reference passing of objects in PHP

Many data types can be copy-on-write, such as $a=$b, and the two variables give equal values. 
It…

作为一个程序员，数学对你到底有多重要

每个计算机系毕业的人，大都学过不少数学课，而且不少学校的计算机系的数学课，通常比一般的其他工科专业的数学要难一些，比如不上高等数学，而是学数学分析，不上线性代数而去上高等代数。但是，大部分毕业了后去做程序员的人，即使是所谓的名校计算机系毕业的，大都工作中也基本完全用不上学的那些数学，基本上，一半时间在CRUD，另一半时间在处理各类字符串、链表、Hash表，知道在面试中回答各种排序的时间复杂度是他们需要的数学的上线了。

How to refactor the “arrow type” code

The article is a bit long, I will give relevant thoughts and summary comments at the end of the article, you can jump to the end.

The so-called arrow type code is basically the case shown in the picture below.

Game Pukul Bola Sederhana Menggunakan Java

Ini sebenarnya dulu proyek ujian Praktikum Sistem Terdistribusi, tapi rasanya malah jadi produk gagal :D. Jadinya ya ane open saja source code-nya siapa tahu ada yang ngembangin dan bisa lebih bermanfaat. Niatnya dulu bikin game sederhana yang bisa…

A Low Level Curriculum for C and C++ (Part 1)

NOTE: This was originally posted on AltDevBlogADay.com in approx. 2012
All the…