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Signs that you're a bad programmer
1. Inability to reason about codeReasoning about code means being able to follow the execution path ("running the program in your head") while knowing what the goal of the code is.SymptomsThe presence of "voodoo code", or code that has no effect on the goal of the program but is diligently maintained anyway (such as initializing variables that are never used, calling functions that are irrelevant to the goal, producing output that is not used, etc.)Executing idempotent functions multiple times (...
Sign,Programmer,Characteristics,Knowledge,Skill 2011-10-20 08:56:16
How does computer boot up?
The whole boot process of computer can be summarized in 4 phases. 1. BIOS In the 70's read-only memory(ROM) was invented. The boot program is written into ROM, the first thing the computer does is to read and execute this program when it's powered on. The program in this chip is called "Basic Input/Output System" (BIOS). 1.1 Power-On Self-Test The BIOS will first check whether the computer hardware can fulfill the basic conditions for booting up, this process is called Power-On Self-Test...
HTML5 and Accessibility
Accessibility for people with disabilities is a legal responsibility in many countries. It's also the right thing to do, and one of the characteristics distinguishing professional developers from the WWWs: WYSIWYG-wielding wannabes. But for many, accessibility has been a somewhat black art, requiring adding extra stuff to your code like alt text, table summaries, ARIA information that can be difficult to test by developers who are not assistive technology users themselves.The arrival of HTML5 ha...
HTML5,Accessibility,Video,Music,Canvas 2011-08-19 08:13:44
Tips on Writing for Tech Blogs
If you know your stuff when it comes to tech, you might be inspired to start contributing articles to tech blogs. A friend or colleague may suggest the idea to you, or you may see an invitation for submissions, much like the one on this website. Sounds like a great idea; but what do you know about writing articles, blog posts, or other types of content? Writing is a skill, and there are also practical aspects to writing that you need to be aware of before you start creating your own pieces. Gett...
An Object is not a Hash
Following my article A String is not an Error, I want to bring attention to an issue that similarly applies to JavaScript in general, but has special relevance in the Node.JS environment. The problem boils down to the usage of {} as a data-structure where the keys are supplied by untrusted user input, and the mechanisms that are normally used to assert whether a key exists. Consider the example of a simple blog created with Express. We decide to store blog posts in memory in a {}, indexed ...
Object,Hash,Node.js,JavaScript 2012-01-19 10:16:10
PaaS vs. SaaS: The Differences And How To Pick The Right Option
Platform as a service (PaaS) and software as a service (SaaS) are two kinds of cloud computing products that enable businesses and their clients to deliver and use various services, respectively. Before diving into the differences between the two concepts, it’s important to take a step back and understand what a cloud service really is. Cloud computing primarily refers to large storage of data, programs, and operations that are accessible via the Internet and are not stored on a user&rsquo...
Using public key authentication in SSH
SSH is a popular cryptographic network protocol for secure network service operation. It is frequently used in remote server login. For a system administrator or software developer, SSH is frequently used to access remote servers or development servers or testing servers etc. To login with SSH, there are different authentication mechanisms : password, public key and interactive etc. If a remote server needs to be accessed frequently, password authentication may be too troublesome as p...
LINUX,DEBUG,SSH,PUBLIC KEY 2016-09-10 05:55:46
Different types of keystore in Java -- PKCS12
PKCS12 is an active file format for storing cryptography objects as a single file. It can be used to store secret key, private key and certificate.It is a standardized format published by RSA Laboratories which means it can be used not only in Java but also in other libraries in C, C++ or C# etc. This file format is frequently used to import and export entries from or to other keystore types. Next we will explain the operations which can be performed on PKCS12 keystore. Create PKCS12 keystore Be...
Square bracket in checkbox name
0down votefavorite i have a form with checkboxes like this: <input type=\"checkbox\" name=\"type[]\" value=\"1\" />Fast Food<br> <input type=\"checkbox\" name=\"type[]\" value=\"2\" />Table Service<br> <input type=\"checkbox\" name=\"type[]\" value=\"3\" />Cafeteria<br> when i use the brackets in the name (type[]), my php works: $type=$_POST[\'type\']; echo \"types are:\";for ( $counter...
Square bracket,PHP,JavaScript,Array of n 2011-03-22 10:32:40
The Evolution of a Programmer
High School/Jr.High 10 PRINT "HELLO WORLD" 20 END First year in College program Hello(input, output) begin writeln('Hello World') end. Senior year in College (defun hello (print (cons 'Hello (list 'World)))) New professional #include <stdio.h> void main(void) { char *message[] = {"Hello ", "World"}; int i; for(i = 0; i < 2; ++i) printf("%s", message[i]); printf("\n"); } Seasoned professional #include <iostream....
Humour,Evolution,Programmer 2012-04-23 06:30:33
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