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Strange, unexpected behavior (disappearing/changing values) when using Hash default value, e.g. Hash
... in the hash if required.
So we must store the default value in the hash from within the block if we wish to use << instead of <<=:
h = Hash.new { |h, k| h[k] = [] }
h[0] << 'a' #=> ["a"]
h[1] << 'b' #=> ["b"]
h #=> {0=>["a"], 1=>["b"]}
This e...
Best practice: PHP Magic Methods __set and __get [duplicate]
...
Coming from the nice world of compiled, statically typed languages, I would say, if your object is "from the database layer and has dynamic properties", then my vote would be for a ->get($columnName) method: it makes it clear tha...
Why escape_javascript before rendering a partial?
... Yeah, actually it's more of a formatting method. It doesn't prevent users from executing their own javascript. Nothing can prevent that.
– LasagnaAndroid
Feb 23 '15 at 1:31
3
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Why are Perl 5's function prototypes bad?
...efault list context.)
In particular, they make it hard to pass parameters from arrays. For example:
my @array = qw(a b c);
foo(@array);
foo(@array[0..1]);
foo($array[0], $array[1], $array[2]);
sub foo ($;$$) { print "@_\n" }
foo(@array);
foo(@array[0..1]);
foo($array[0], $array[1], $array[2]);...
Prevent scrolling of parent element when inner element scroll position reaches top/bottom? [duplicat
...ll as the event, and populates originalEvent.detail, whose +/- is reversed from what is described above. It generally returns intervals of 3, while other browsers return scrolling in intervals of 120 (at least on my machine). To correct, we simply detect it and multiply by -40 to normalize.
@amusti...
Naming conventions for java methods that return boolean(No question mark)
...ognize boolean getters, either use getXXXX() or isXXXX() as a method name. From the Java Beans spec:
8.3.2 Boolean properties
In addition, for boolean properties, we allow a getter method to match the pattern:
public boolean is<PropertyName>();
This “is<PropertyName>” method may be ...
What do the plus and minus signs mean in Objective-C next to a method?
... of instance members. Instance methods of the class can also not be called from within a class method unless they are being called on an instance of that class.
(-) Instance methods:-
On the other hand require an instance of the class to exist before they can be called, so an instance of a class n...
How do you write a migration to rename an ActiveRecord model and its table in Rails?
...e caveats:
Let's use a real-world example I faced today: renaming a model from 'Merchant' to 'Business.'
Don't forget to change the names of dependent tables and models in
the same migration. I changed my Merchant and MerchantStat models to Business and BusinessStat at the same time. Otherwise I'...
Creating an index on a table variable
...lared with this syntax however SQL Server 2016 relaxes this a bit further. From CTP 3.1 it is now possible to declare filtered indexes for table variables. By RTM it may be the case that included columns are also allowed but the current position is that they "will likely not make it into SQL16 due t...
What is a “slug” in Django?
...-virgin
In this example, the-46-year-old-virgin is a slug: it is created from the title by down-casing all letters, and replacing spaces by hyphens -.
Also see the URL of this very web page for another example.
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