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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 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.
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Returning a value from thread?
... unnecessary because no reads or writes to value are occurring at the same time. But, yeah, always be mindful of when a lock is necessary.
– Brian Gideon
Feb 23 '15 at 17:19
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Using jQuery to test if an input has focus
...t ourselves. Just use $("..").is(":focus")
jQuery 1.5 and below
Edit: As times change, we find better methods for testing focus, the new favorite is this gist from Ben Alman:
jQuery.expr[':'].focus = function( elem ) {
return elem === document.activeElement && ( elem.type || elem.href )...
How to pass JVM options from bootRun
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Doing this with gradle required that the system property provided at the time of running gradle build, shown here,
gradle build -Ddeep.test.run=true
was indeed passed through to the tests.
Hope this helps others trying out this approach for running tests conditionally.
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How to get URL parameter using jQuery or plain JavaScript?
...short and, contrary to accepted solution, doesn't need to reparse url each time you need a value. Could be slightly improved with replace(/[?&;]+([^=]+)=([^&;]*)/gi to reconize ";" character as a separator too.
– Le Droid
Feb 5 '16 at 18:16
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When and why would you seal a class?
... sounds vague but, assuming we don't write "security features" most of the time, does that mean reason #1 hardly applies? Reason #2 is for performance-tuning. How much performance difference are we talking about? Are they significant enough to justify altering a non-security class's definition? Even...
How do I base64 encode (decode) in C?
.../utils/base64.c and the Apache at https://opensource.apple.com/source/QuickTimeStreamingServer/QuickTimeStreamingServer-452/CommonUtilitiesLib/base64.c.
Here is the time (in microseconds) to encode 32K of data using the different algorithms I have tested up to now:
jounimalinen 25....
How to find difference between two Joda-Time DateTimes in minutes
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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 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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