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How does facebook, gmail send the real time notification?
...n a given interval (perhaps every few seconds), to check if something has happened. However, this can be pretty network intensive, and you often make pointless requests, because nothing has happened.
The way Facebook does it is using the comet approach, rather than polling on an interval, as soon a...
How to display unique records from a has_many through relationship?
...g to learn from nonetheless (actually I may use this somewhere else in the app). What are your thoughts on performance for the various approaches mentioned on this page?
– Andy Harvey
May 3 '11 at 12:31
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When to favor ng-if vs. ng-show/ng-hide?
...Elements that are not in the DOM have less performance impact and your web app might appear to be faster when using ng-if compared to ng-show/ng-hide. In my experience, the difference is negligible. Animations are possible when using both ng-show/ng-hide and ng-if, with examples for both in the Angu...
Storing DateTime (UTC) vs. storing DateTimeOffset
... This is the best explanation I have read about when it would be appropriate, and I have read a lot For us, from this, it does not seem so. We get the time in UTC for our external data, and we know the location from another source if needed (and it never has been). Thanks for making it ...
What is the difference between “git init” and “git init --bare”?
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To test git commands try: github.com/sergiocabral/App.GitPlayground
– Sergio Cabral
Nov 8 '19 at 7:44
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Validate that a string is a positive integer
...lly big numbers, this will go to scientific notation, which may break this approach. (I don't quite know where the split is, the details are in the spec, but for whole numbers I believe it's at the point you've exceeded 21 digits [by which time the number has become very imprecise, as IEEE-754 doubl...
Smooth GPS data
...ement; variance = accuracy*accuracy;
} else {
// else apply Kalman filter methodology
long TimeInc_milliseconds = TimeStamp_milliseconds - this.TimeStamp_milliseconds;
if (TimeInc_milliseconds > 0) {
// time has moved on, so the uncert...
Possible reason for NGINX 499 error codes
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As a special case, I noticed it sometimes happen when the end-user double-clicks a form submit button. The form is sent twice, but only one response is expected by the client. This can be worked around by disabling (at least for a few seconds) buttons in JS the first ...
What is global::?
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What would happen if I has an auto-generated class with a class prefixed with the global namespace and the class was called Foo I had a class I had created which also was called Foo also with no namespace?
– Sachin ...
Purpose of buildscript block in Gradle
...ation in order to compile and evaluate the rest of the build script. What happens under the hood is that Gradle separates the build script into two scripts (the buildScript block and everything else) so that it can process them separately.
– Peter Niederwieser
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