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what exactly is device pixel ratio?
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Short answer
The device pixel ratio is the ratio between physical pixels and logical pixels. For instance, the iPhone 4 and iPhone 4S report a device pixel ratio of 2, because the physical linear resolution is double the logical linear resolution.
Physical resolution: 960 x 640
Logical resolutio...
Open files in 'rt' and 'wt' modes
Several times here on SO I've seen people using rt and wt modes for reading and writing files.
4 Answers
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Best Practice to Organize Javascript Library & CSS Folder Structure [closed]
...ur HTML5 application. This is not an attempt to create any kind of standard. Instead, I will make suggestions on how to group and name files in a logical convenient way. Your Project Let’s assume you are building an HTML5 application. In some cases you may use the root of your server as the ...
Prevent HTML5 video from being downloaded (right-click saved)?
...t your regular skiddie from blatantly ripping your video by right clicking and Save As. But then they could just disable JS and get around this or find the video source via the browser's debugger. Plus this is bad UX. There are lots of legitimate things in a context menu than just Save As.
You coul...
How can I change image tintColor in iOS and WatchKit
...mage.
You must add your image to an Asset Catalog in your WatchKit App, and set the image set to be rendered as a Template Image in the Attributes Inspector. Unlike for an iPhone app, you cannot set the template rendering in code in the WatchKit Extension at present.
Set that image to be used in ...
Overriding fields or properties in subclasses
I have an abstract base class and I want to declare a field or a property that will have a different value in each class that inherits from this parent class.
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What are the underlying data structures used for Redis?
...every Redis operation you'll find the time complexity in the documentation and, if you have the set of operations and the time complexity, the only other thing you need is some clue about memory usage (and because we do many optimizations that may vary depending on data, the best way to get these la...
Java String split removed empty values
...le more details:
split(regex) internally returns result of split(regex, 0) and in documentation of this method you can find (emphasis mine)
The limit parameter controls the number of times the pattern is applied and therefore affects the length of the resulting array.
If the limit n is greater than...
How to use git with gnome-keyring integration
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I was hesitant to do this at first, but I did finally and it works perfectly. As the docs for gitcredentials say, you might also want to do git help -a | grep credential- and see if you have other helpers installed. Ones that come by default are credential-cache (remember passwo...
How to find event listeners on a DOM node when debugging or from the JavaScript code?
I have a page where some event listeners are attached to input boxes and select boxes. Is there a way to find out which event listeners are observing a particular DOM node and for what event?
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