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What is the purpose of the reader monad?
...r passing (implicit) configuration information through a computation.
Any time you have a "constant" in a computation that you need at various points, but really you would like to be able to perform the same computation with different values, then you should use a reader monad.
Reader monads are a...
Python memoising/deferred lookup property decorator
...ctor but only upon first read. These attributes do not change over the lifetime of the instance, but they're a real bottleneck to calculate that first time and only really accessed for special cases. Hence they can also be cached after they've been retrieved from the database (this therefore fits th...
How do I write a custom init for a UIView subclass in Swift?
...In this case, you would initialize them in awakeFromNib() or at some later time.
class TestView : UIView {
var s: String?
var i: Int?
init(s: String, i: Int) {
self.s = s
self.i = i
super.init(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
}
require...
How are the points in CSS specificity calculated
...but it's not base 10. It's base 256. Here's how it works:
(28)2 or 65536, times the number of ids in the selector
+ (28)1 or 256, times the number of class-names in the selector
+ (28)0 or 1, times the number of tag-names in the selector
This isn't very practical for back-of-the-envelop exercises...
How to convert Strings to and from UTF8 byte arrays in Java
...harset class. The JDK documentation lists supported encodings.
90% of the time, such conversions are performed on streams, so you'd use the Reader/Writer classes. You would not incrementally decode using the String methods on arbitrary byte streams - you would leave yourself open to bugs involving ...
How to find difference between two Joda-Time DateTimes in minutes
...
This will get you the difference between two DateTime objects in milliseconds:
DateTime d1 = new DateTime();
DateTime d2 = new DateTime();
long diffInMillis = d2.getMillis() - d1.getMillis();
sha...
How to get the current date/time in Java [duplicate]
What's the best way to get the current date/time in Java?
28 Answers
28
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How to convert SSH keypairs generated using PuTTYgen (Windows) into key-pairs used by ssh-agent and
...se's keys are working fine, and
you've sent this key back to the user 15 times.
ssh-keygen -i -f keyfile.pub > newkeyfile.pub
Should convert an existing puttygen public key to OpenSSH format.
share
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How do I find the install time and date of Windows?
...on, but how can I find out (hopefully via an API/registry key) the install time and date of Windows?
19 Answers
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What is the behavior difference between return-path, reply-to and from?
...body.
Now, let's describe the different "FROM"s.
The return path (sometimes called the reverse path, envelope sender, or envelope from — all of these terms can be used interchangeably) is the value used in the SMTP session in the MAIL FROM command. As you can see, this does not need to be the...