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What is tail call optimization?
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Tail-call optimization is where you are able to avoid allocating a new stack frame for a function because the calling function will simply return the value that it gets from the called function. The most common use is tail-recursion, where a recursive function written to take ad...
Array include any value from another array?
...de? may be faster as shown by Lee Jarvis' answer -- probably because & allocates a new Array while another solution does not and works as a simple nested loop to return a boolean.
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What is the difference between lock and Mutex?
...s really a shortcut to the Monitor class, on the other hand tries to avoid allocating kernel resources and transitioning to kernel code (and is thus leaner & faster - if one has to find a WinAPI construct that it resembles, it would be CriticalSection).
The other difference is what others point...
Is there a MySQL option/feature to track history of changes to records?
...ess some comments in no particular order:
I did my own implementation in PHP that was a little more involved, and avoided some of the problems described in comments (having indexes transferred over, signifcantly. If you transfer over unique indexes to the history table, things will break. There ar...
CSS selector for “foo that contains bar”? [duplicate]
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yea i know, php much
– Muhammad Umer
Aug 23 '13 at 15:37
27
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What is the etymology of 'slug'? [closed]
...meaning #1 in the other answer. See also the dates in etymonline.com/index.php?term=slug
– Walter Tross
Jan 1 '16 at 11:36
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Freeze the top row for an html table only (Fixed Table Header Scrolling) [duplicate]
...CT pixel widths because tables are so cute in that different browsers will allocate pixels differently based on calculations and you simply CANNOT (AFAIK) guarantee that the distribution will be perfect in all cases. It becomes glaringly obvious if you have borders within your table.
I took a diffe...
Uncaught ReferenceError: jQuery is not defined [duplicate]
...c="http://code.jquery.com/jquery-1.10.1.min.js"
in wp-admin/admin-header.php
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How to link to apps on the app store
...roductViewController *storeViewController = [[SKStoreProductViewController alloc] init];
storeViewController.delegate = self;
NSNumber *identifier = [NSNumber numberWithInteger:iTunesItemIdentifier];
NSDictionary *parameters = @{ SKStoreProductParameterITunesItemIdentifier:identifier ...
How to design a multi-user ajax web application to be concurrently safe
...r cruel to your infrastructure if you do not configure your (Apache?) and (php?) well enough to be "lightweight" starters. It is desirable to optimize the polling request on the serverside so that it runs for far less time than the length of the polling interval. Splitting that runtime in half might...