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Performance surprise with “as” and nullable types
...a few machine code instructions. The cast is also easy, the JIT compiler knows the location of the value bits in the object and uses them directly. No copying or conversion occurs, all machine code is inline and takes but about a dozen instructions. This needed to be really efficient back in .NET...
Why is the minimalist, example Haskell quicksort not a “true” quicksort?
...(1), but not (2). How (2) is done may not be obvious if you don't already know the technique!
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DataSet panel (Report Data) in SSRS designer is gone
... the actual report layout itself.
Click inside the actual report layout.
Now select "View" from the main menu bar.
Now select "Report Data" which is the last item.
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Spinlock versus Semaphore
... few threads are contending for the lock at the same time. Of course every now and then two threads will try to acquire the lock at the same time (if this couldn't happen you wouldn't need a lock!), but this is rather the exception than the rule in a "healthy" system.
In such a case, a spinlock g...
How to build for armv6 and armv7 architectures with iOS 5
...u have to support older stuff for a while. And I guess the Xcode dev team knows this too, which is why you can add armv6 support back in quite simply.
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Auto margins don't center image in page
...a flexbox: display: flex; align-items: center; justify-content: center and now your content is horizontally and vertically centered. Or move that to align-self: center; justify-self: center on the content itself. css-tricks.com/snippets/css/a-guide-to-flexbox
– Mike 'Pomax' Kam...
Which is preferred: Nullable.HasValue or Nullable != null?
... I've actually been meaning to update this answer on that fact for a while now, but I'm lazy and/or busy. This comment will have to do for now :)
– Perrin Larson
Jun 11 '15 at 20:15
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Cookie blocked/not saved in IFRAME in Internet Explorer
...n, a login, or any data collection (***** Analytics, anyone?), you must acknowledge it in your P3P)
STP: Information is retained to meet the stated purpose. This requires information to be discarded at the earliest time possible. Sites MUST have a retention policy that establishes a destruction time...
Difference between “module.exports” and “exports” in the CommonJs Module System
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At this time module.exports and exports pointing to the same reference.
Now, imagine you re-write
greet.js as
exports = function () {
console.log('Hello World');
};
console.log(exports);
console.log(module.exports);
the output will be
[Function]
{}
the reason is : module.exports is a...
Sass or Compass without ruby?
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Sass was originally written for Ruby, but now they've created libSass which is a C/C++ port of the Sass engine, which makes it easier to integrate the engine into an IDE or another language. At this point, you can use the Sass engine in Ruby, Node.js, Python, PHP, Ja...