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What's the easiest way to install a missing Perl module?
...commands it stays at the command line. So, "ppm help", "ppm install ...", etc.
– Bill Ruppert
Apr 13 '12 at 22:40
Not...
Simple and fast method to compare images for similarity
...hreshold. It is also very sensitive to color changes (brightness, contrast etc.). You can combine it with the previous two.
Detectors of salient points/areas - such as MSER (Maximally Stable Extremal Regions), SURF or SIFT. These are very robust algorithms and they might be too complicated for your ...
How can I determine if a JavaScript variable is defined in a page? [duplicate]
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To avoid accidental assignment, I make a habit of reversing the order of the conditional expression:
if ('undefined' !== typeof x) {
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Java's Virtual Machine and CLR
...popping those operands off the stack whenever an instruction (add, divide, etc) needs to consume those operands. Each instruction pushes its results back onto the stack.
It's a convenient way to implement a virtual machine, because pretty much every CPU in the world has a stack, but the number of r...
Can I store images in MySQL [duplicate]
...nces to the images in the database. e.g. path to the image,the image name, etc.. Or alternatively, you may even store images on a content delivery network (CDN) or numerous hosts across some great expanse of physical territory, and store references to access those resources in the database.
Images ...
Python circular importing?
... get away with it. But when one of your co-workers innocently changes the order of definitions in a third module, the code will break.
In some cases you can resolve circular dependencies by moving an import statement down below symbol definitions needed by other modules. In the examples above, def...
React ignores 'for' attribute of the label element
...l element (as returned by document.createElement, document.getElementById, etc) you'd access its for property as label.htmlFor.
– Sophie Alpert
Apr 1 '14 at 17:17
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How to check if a String is numeric in Java
...fine for most ints but not so for numbers with decimals, group separators, etc.
– Jeff Mercado
Feb 8 '13 at 23:19
43
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Shall we always use [unowned self] inside closure in Swift
...t to use [unowned self]. Sometimes you want the closure to capture self in order to make sure that it is still around by the time the closure is called.
Example: Making an asynchronous network request
If you are making an asynchronous network request you do want the closure to retain self for when...
Detect the specific iPhone/iPod touch model [duplicate]
...iPhone4,1
iPad 2 is iPad2,1 iPad2,2 and iPad2,3 depending on version (GSM etc)
iPad 3 is iPad3,1 iPad3,2 and iPad3,3 depending on version (GSM etc)
See Iphone secrets (scroll down to "internal product codes")
Another good source is:
everyiphone.com
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