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Difference between `data` and `newtype` in Haskell

...e. In particular, data introduces a type that is "lifted", meaning, essentially, that it has an additional way to evaluate to a bottom value. Since there's no additional constructor at runtime with newtype, this property doesn't hold. That extra pointer in the Book to (,) constructor allows us to ...
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Iterate through object properties

... check: for (var prop in obj) { if (Object.prototype.hasOwnProperty.call(obj, prop)) { // do stuff } } It's necessary because an object's prototype contains additional properties for the object which are technically part of the object. These additional properties are inherited fr...
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Ruby on Rails: How can I revert a migration with rake db:migrate?

...ake db:migrate VERSION=<version number> – Ajedi32 Jun 3 '13 at 19:06 3 At least for rails 3...
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Why does Enumerable.All return true for an empty sequence? [duplicate]

The code creates an empty collection of string, then tries to determine if all the elements in the collection are "ABC". If you run it, b will be true. ...
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What is the advantage of using forwarding references in range-based for loops?

...or<bool> v(10); for (auto&& e : v) e = true; } All that being said, I wouldn't code this way unless you knew you needed to satisfy such a use case. I.e. I wouldn't do this gratuitously because it does cause people to wonder what you're up to. And if I did do it, it woul...
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How do I pass command-line arguments to a WinForms application?

...= "/lol"; args[3] = "nisp"; What could be easier? – Callum Rogers Jul 24 '09 at 19:22 cant believe i saw that 'string[...
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Is it possible to use JavaScript to change the meta-tags of the page?

... @bobince: Actually, the SKYPE_TOOLBAR one still takes effect if you insert it with js (which is useful as html5 validator doesn't like that meta tag). – DaedalusFall Nov 15 '11 at 13:23 ...
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val() vs. text() for textarea

... Yoav Kadosh 3,23544 gold badges2323 silver badges5252 bronze badges answered Apr 10 '14 at 16:50 Kshitij Saxena -KJ-Kshitij Saxena -K...
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How do I get the first element from an IEnumerable in .net?

... Erik ForbesErik Forbes 32.9k2626 gold badges9292 silver badges116116 bronze badges ...
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how to display full stored procedure code?

... pg_proc that's it! Whew I'm glad they saved a few bytes of space by not calling it pg_procedure...geez. :) – darren Aug 19 '10 at 19:36 14 ...