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Detect Retina Display
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In order to detect the Retina display reliably on all iOS devices, you need to check if the device is running iOS4+ and if the [UIScreen mainScreen].scale property is equal to 2.0. You CANNOT assume a device is running iOS4+ if...
What does 'public static void' mean in Java?
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Since the questioner is still learning: the order of these keywords is also important. All modifiers first (public, static, private, etc.) then the return type (void in this case).
– Pindatjuh
Mar 5 '10 at 21:34
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Capture HTML Canvas as gif/jpg/png/pdf?
... scope of this question a bit, with some useful tidbits on the matter.
In order to get the canvas as an image, you should do the following:
var canvas = document.getElementById("mycanvas");
var image = canvas.toDataURL("image/png");
You can use this to write the image to the page:
document.writ...
How to apply shell command to each line of a command output?
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Quote the "$line" in the while loop, in order to avoid word splitting.
– ignis
Dec 10 '12 at 16:12
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missing private key in the distribution certificate on keychain
... Basically, we have a company developer account (not enterprise) and so in order to submit our app, I requested from our team lead to send me the distribution certificate and create and send me a distribution provisioning profile.
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What is a Y-combinator? [closed]
...guy by the name of
Haskell Curry has a neat trick, if you have good higher order
functions then you only need functions of 1 variable. The
proof is that you can get from functions of 2 (or more in the
general case) variables to 1 variable with a purely
mechanical text transformation like this:
// ...
Why shouldn't I use mysql_* functions in PHP?
...eceded by a colon, instead of question marks. We don't care about position/order of value in name place holder:
$stmt->bindParam(':bla', $bla);
bindParam(parameter,variable,data_type,length,driver_options)
You can also bind using an execute array as well:
<?php
$stmt = $db->prepare("S...
How to loop through file names returned by find?
... bmargulies are safe to use with white space in the file/folder names.
In order to also have the - somewhat exotic - case of newlines in the file/folder names covered, you will have to resort to the -exec predicate of find like this:
find . -name '*.txt' -exec echo "{}" \;
The {} is the placehol...
Getters \ setters for dummies
...examples, the internal property names are abstracted with an underscore in order to discourage users from simply doing foo.bar vs. foo.get( 'bar' ) and getting an "uncooked" value. You can use conditional code to do different things depending on the name of the property being accessed (via the name ...
Must Dependency Injection come at the expense of Encapsulation?
... should be fully valid after construction, such that anything they need in order to perform their role (i.e. be in a valid state) should be supplied through the constructor anyway. If you have an object that requires a collaborator to work, it seems fine to me that the constructor publically advert...