Introduction

Recently, I have been working on live streaming related projects. Although I am a frontend developer, I still need to understand some of the principles of live streaming. At least, I need to know what formats are available and what are the advantages and disadvantages of each format. This will make the development process smoother.

This article will briefly record some of my experiences and information. If you want to have a deeper understanding of HLS, you can refer to the following two articles:

1. Choosing a Live Streaming Protocol: RTMP vs. HLS
2. HLS Protocol for Online Video - Study Notes: M3U8 Format Explanation and Practical Application Analysis

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Introduction

Redis is an in-memory key-value database, often used for caching data to reduce the load on the backend database. This article will briefly introduce some of the useful features of Redis and where it can be applied.

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(Original article published at: http://blog.techbridge.cc/2016/05/20/fast-way-to-get-apk-information/)

Introduction

In a previous article, we introduced how to decompile an Android APK. By decompiling, we can obtain a lot of information related to the APK, such as AndroidManifest.xml. With this file, we can see some basic information about the APK, and also see the entire code of the APK and the resources used (pictures, videos, sounds, etc.).

But if today we only want to know the basic information, and we don’t care about how the APK is written or what resources it uses, what should we do? Decompiling takes some time, and the larger the APK, the longer it takes. Is there a better way?

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(Original post published at: http://blog.techbridge.cc/2016/04/23/fast-restful-nodejs-api-backend/)

Introduction

Some websites today use the Single Page Application approach, where the backend only provides APIs for the frontend to fetch data, achieving complete separation of the frontend and backend. There are many choices for the frontend, you can use Angular, Ember.js, or React + Redux. As for the backend API, it must conform to a fixed format to make it easier for frontend developers to fetch data. And this “fixed format” is most commonly known as our focus today: RESTful.

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Introduction

When writing programs, we often use the “search” function. The simplest search is to find the number you want in a string of numbers, which is also our topic today.

This article will be divided into three parts. The first part will introduce the linear search method, the second part will introduce the binary search method, and the last part will discuss the different implementation methods of the binary search method under different conditions.

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Recently, there was an incident where our server was attacked by a large number of requests. Unfortunately, the server was hosting a forum service. Assuming that the attack point was the forum homepage, each request would query the database and there were a lot of joins. Some of the instructions were POST, which would update the database. This caused the database to lock up and the CPU to skyrocket, leading to a crash.

If the forum was self-written, we could add a cache like Redis between the database and application. However, this forum system is someone else’s and we cannot modify it.

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The full name of CS50 is Introduction to Computer Science, which is a general education course at Harvard University. It is available on edx, and anyone can take it. There are even teaching assistants to help you with programming assignments (only programming assignments, not other types of assignments like paper-based ones).

The first time I heard about CS50 was through this report: CS50: A “hard” course taken by over 800 Harvard students, what makes it so attractive?. It wasn’t until I finished the course recently that I understood what makes this course so impressive.

Let’s start with the meaning of the title: An Ocean-like Programming Course. Why the ocean? Because this course is deep and wide. How deep and wide is it? I recorded the course outline and assignments for each week. If you have a friend with a computer science background, they will know what I mean.

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Introduction

For Android engineers, understanding how to decompile can enhance their understanding of the Android system and also consider how to protect their APK from being decompiled.

For the general public, many ready-made tools can help us easily decompile APKs and see Java source code, satisfying our curiosity.

This article only introduces the use of some tools, suitable for beginners to watch. If you want to understand more underlying knowledge, you can refer to the extended reading attached at the end of the article.

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Although I interviewed about 20 companies last year, it wasn’t until recently that I realized how important the interview process is for a company. Of course, the importance of HR cannot be underestimated either.

If the HR of a company does a good job and the interview process makes the interviewee feel cared for, in this era of open internet, the job seeker may share with friends later: Hey, I went to XXX today, their interview process is awesome! Conversely, a poor interview process can cause harm for years to come, with negative reviews one after another. Below are some practical examples, all of which are positive examples, and I will directly mention the company names. Yes, I remember the companies that treated me well when I went for an interview!

Today I want to talk to you about my ideal interview process, which can be roughly divided into three steps:

1. Before the interview (arranging the interview)
2. During the interview
3. After the interview

Let’s discuss each of these three steps one by one.

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For those who write code, no matter which programming language or development environment they use, they will need to execute some commands at some point. This is when they will open the terminal and start typing commands. The most commonly used commands are cd, ls, git, ssh, rsync, etc. However, the built-in terminal is actually quite difficult to use. Today, I want to recommend a better option to you.

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