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How to use concerns in Rails 4
...nheritance? What's wrong with creating a common base class and subclassing from that common base class?
– Chloe
Sep 6 '15 at 0:14
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Iterator Loop vs index loop [duplicate]
...r code becomes more portable between containers. You can switch containers from std::vector to std::list or other container freely without changing much if you use iterator such rule doesn't apply to operator[].
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Targeting position:sticky elements that are currently in a 'stuck' state
... It isn't just position... imagine a :stuck that changes the top value from 0 to 300px, then scroll down 150px... should it stick or not? Or think about an element with position: sticky and bottom: 0 where the :stuck maybe changes font-size and therefore the elements size (therefore changing t...
$on and $broadcast in angular
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The best way to avoid deciding between $emit or $broadcast is to channel from the $rootScope and use $broadcast to all its children. Which makes our case much easier since our dom elements are siblings.
Adding $rootScope and lets $broadcast
app.controller('FirstCtrl', function($rootScope, $scop...
Is it possible to decrypt MD5 hashes?
...ecommendation beyond "Don't roll your own authentication system." Find one from a reputable supplier, and use that. Both the design and implementation of security systems is a tricky business.
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Abort makefile if variable not set
... variable only if a certain target is invoked.
$(call check_defined, ...) from inside the recipe
Just move the check into the recipe:
foo :
@:$(call check_defined, BAR, baz value)
The leading @ sign turns off command echoing and : is the actual command, a shell no-op stub.
Showing targe...
Return type of '?:' (ternary conditional operator)
...no copy is made. — end note] by copy-initializing a temporary of type T2 from E1 and using that temporary as the converted operand.
Otherwise (i.e., if E1 or E2 has a non class type, or if they both have class types but the underlying classes are not either the same or one a base class of the othe...
Understanding Fragment's setRetainInstance(boolean)
... to saved orientation changing Time.Say I have download a bunch of Bitmaps from server and each one is 1MB, when the user accidentally rotate his device, I certainly don't want to do all the download work again.So I create a Fragment holding my bitmaps and add it to the manager and call setRetainIns...
In JavaScript, does it make a difference if I call a function with parentheses?
...ret becomes your Multiply function as opposed to being the result obtained from your Multiply function. Calls to ret() will cause your Multiply function to be executed, and you can call it exactly as if you'd called Multiply(operator, operand):
var out = ret(3, 4);
is the same as
var out = Multi...
Using Java 8's Optional with Stream::flatMap
...e description of what it was doing. The key subtlety is the transformation from Optional<Other> to Optional<Stream<Other>>. Once you grok this it makes sense, but it wasn't obvious to me.
I'll acknowledge, though, that things that are initially obscure can become idiomatic over ti...