SEARCH KEYWORD -- RGC color
The hidden risk of passing slice as function parameter
In Go's source code or other open source libraries, there are lots of cases where a slice pointer is passed to function instead of slice itself. This brings up a doubt why not passing slice directly as its internal is backed by an array pointer to point to underlying data? For example, in log package, the formatHeader function takes a parameter buf as type *[]byte instead of []byte. func (l *Logger) formatHeader(buf *[]byte, t time.Time, file string, line int) {} Let's understand the r...
GOLANG,SLICE,SLICE POINTER 2020-12-13 06:11:14
Save QWidget as image
Qt library is an excellent GUI library for C++ programmers developed by Nokia and now is an open source project. Often, we may use QPainter to draw strings, lines or images on a QWidget. We can override the QWidget's paintEvent() method when we want to use QPianter object to draw something on a QWidget. If we want to save the items drawn on QWidget as image for later reference, what can we do? We can save a QWidget as an image. Here is the code for achieving this: QPixmap pixmap(this->size())...
Rails and Web Development - Take the First Step
Getting started with web development isn’t easy. Looking back to when I started, the first few weeks were the toughest to stick with it. For someone who is new to text editors and the terminal – the installation process can be really overwhelming. I recently went through the process of helping some of my friends get set up with Ruby on Rails and after doing it a few times, I realized it would be helpful to write a post that others looking to get started could refer to.The following...
Web design,Rail,Ruby,Ruby on Rails 2011-10-17 11:16:51
Share on Twitter link
Ever wanted to give your readers, or your client’s readers a chance to share the post quickly on Twitter?The code is straight forward:<a href=â€http://twitter.com/home?status=Currently reading http://www.test.com/post-url†title=â€Click to share this post on Twitterâ€>Share on Twitter</a>If you’re using WordPress and want to automate this, simply use the following to insert the link to the current post in the loop into your link:<a href=â€ht...
Twitter,Share button,Customize,Custom 2011-08-24 10:55:51
Reproduce "MySQL server has gone away" in PHP
If you want to debug the issue of "MySQL server has gone away", you can reproduce it with below steps: Modify configuration file: sudo vi /etc/mysql/my.cnf Make below changes: [mysqld] wait_timeout = 30 interactive_timeout = 30 Restart the service: sudo /etc/init.d/mysql restart Write below PHP codes: $link = mysql_connect('127.0.0.1', 'root', 'root'); if (!$link)&nbs...
MySQL,debug,rMySQL server has gone away 2013-04-15 11:33:14
I've got an idea for an app
I’ve been an iPhone developer for over three years now. The first app I built was CookieCombo. We sold enough copies to go bowling twice, but still it was completely worth it. We tweeted about it, and got some awesome gigs out of that. Everybody was in need of iPhone developers, and there was a huge shortage. Good times.As more and more people got to know that I’m an iPhone developer, I got to hear the following phrase more often: “Hey, you know, I got a great idea for an app...
Idea,App,Induction,Creativity,Innovation 2011-09-08 10:37:09
Most Pressed Keys and Programming Syntaxes
I switch between programming languages quite a bit; I often wondered what happens when having to deal with the different syntaxes, does the syntax allow you to be more expressive or faster at coding in one language or another. I dont really know about that; but what I do know what keys are pressed when writing with different programming languages. This might be something interesting for people who are deciding to select a programming language might look into, here is a post on the...
Keyboard,Programming language,Hottest ke 2011-09-23 13:10:10
A return to good code
Stop doing this:public boolean foo() { if (true) { return true; } else { return false; }}It always amazes me when I dig into an open source project, and I see code written by supposed experts, and reviewed by seasoned professionals, and nobody slaps the wrists of the developer who shoves return statements right in the middle of a method.Tell me, how hard is it to do this:public boolean foo() { boolean flag = true; ...
Funny Linux commands
1. sl You will see a train moving from the right to left on the screen. Install : $ sudo apt-get install sl Run : $ sl It has options like -aiFe: -a An accident seems to happen. You'll feel pity for people who cry for help.-l shows little one.-F It flies.-e Allow interrupt by Ctrl+C. We can also make fun of other people by setting an alias like below: $alias ls=sl When the user types ls, he will see the train instead of the file list. 2. fortune Output one statement, it can be a joke, or famous...
Linux,funny command,figlet,sl 2013-06-08 21:30:26
Python: copying a list the right way
new = old[:] Those proficient in Python know what the previous line do. It copies the list old into new. This is confusing for beginners and should be avoided. Sadly the [:] notation is widely used, probably because most Python programmers don’t know a better way of copying lists.A little bit of pythonic theoryFirst we need to understand how Python manages objects & variables. Python doesn’t have variables like C. In C a variable is not just a name, it ...
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