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How to design a multi-user ajax web application to be concurrently safe

...x is acquired Server receives "Hey, I know artifact x's state from version 123, let me set it to value foo pls." If the Serverside version of artifact x is equal (can not be less) than 123 the new value is accepted, a new version id of 124 generated. The new state-information "updated to version 124...
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Nginx serves .php files as downloads, instead of executing them

...some .php file it's just downloading it... for example... http://5.101.99.123/info.php it's working but... If I go to the main http://5.101.99.123 it's downloading my index.php :/ ...
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Only read selected columns

...wever. Large files are usually compressed. – CoderGuy123 Feb 28 '16 at 9:03 There is a feature request for enabling th...
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What is the explanation for these bizarre JavaScript behaviours mentioned in the 'Wat' talk for Code

... | | false | “false” | 0 | | 123 | “123” | 123 | | [] | “” | 0 | | {} | “[object Object]” | NaN | +-----------------+-------------------+--------...
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Two sets of parentheses after function call

...'s possible to immediately call the returned function: $filter('number')('123') Alternatively, you may keep the returned function for future use: var numberFilter = $filter('number'); numberFilter('123') share ...
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Copy a variable's value into another

...your top-level object. For example, given this object: var obj = { w: 123, x: { y: 456, z: 789 } }; If you do a shallow copy of that object, then the x property of your new object is the same x object from the original: var copy = $.extend( {}, obj ); copy.w = 321; co...
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C# member variable initialization; best practice?

...it : base() unless you add something more specific - which could be : base(123, "abc"), or could be : this(123, "abc"). – Marc Gravell♦ Sep 22 '12 at 9:51 ...
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Why is string concatenation faster than array join?

...and maybe other. a = { nodeA: 'abc', nodeB: 'def' } And b = a.concat('123') b = { nodeA: a, /* { nodeA: 'abc', nodeB: 'def' } */ nodeB: '123' } So in the simplest case the VM has to do nearly no work. The only problem is that this slows down...
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Set Page title using UI-Router

... return `Bar Code ${params.code}`; } }); For the URL path /bar/code/123 that would show "Bar Code 123" as the page title. Note that I'm using ECMAScript 6 syntax to format the string and extract params.code. It would be nice if someone who had the time would put something like this into a di...
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MySQL IF NOT NULL, then display 1, else display 0

... c LEFT JOIN addresses a ON c.customerid = a.customerid WHERE customerid = 123 share | improve this answer | follow | ...