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Why covariance and contravariance do not support value type
...s topic in general.
EDIT: Having reread Eric's blog post myself, it's at least as much about identity as representation, although the two are linked. In particular:
This is why covariant and contravariant conversions of interface and delegate types require that all varying type arguments be of...
Extract every nth element of a vector
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It is better to use seq.int(1L, length(a), 6L), at least for long vectors
– Wojciech Sobala
Mar 8 '11 at 20:45
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Remove ListView separator(in the xml layout file) [duplicate]
...hich one is the best (I don't even know is there is a best way). I know at least 2 different ways to do this in a ListView:
1. Set divider to null:
1.1. Programmatically
yourListView.setDivider(null);
1.2. XML
android:divider="@null" (this goes inside your ListView element)
2. Set divider to...
How is AngularJS different from jQuery
... is necessary as angular is an MVC-Based framework. It also requires an at least general blueprint of the finalized application, since coding depends much on how you want the interactions to be completed.
jQuery is like a free poetry, you write lines and keep some relations and momentum appropriate...
What is a Shim?
...better known as the "Gang of Four".
The "Gang of Four" text outlines at least 3 well established patterns known as, "Proxy", "Adapter" and "Facade" which all provide “shim” type functionality. In most fields it’s often times the use and or miss use of different acronyms for the same root c...
What characters are valid for JavaScript variable names?
... Regarding Encodings: please do use non-ASCII characters, at least in your string literals. We have to eliminate all the stupid software that gets the encodings "screwed up all the time". What a bliss to just type Console.WriteLine("привет") in C# and have it actually work!
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What are the use cases for selecting CHAR over VARCHAR in SQL?
...ead for a VARCHAR. This may vary from DB to DB, but generally, there is at least 1 byte of overhead needed to indicate length or EOL on a VARCHAR.
As was pointed out by Gaven in the comments: Things change when it comes to multi-byte characters sets, and is a is case where VARCHAR becomes a much bet...
In Functional Programming, what is a functor?
...hematics. It has been borrowed by designers of functional languages in at least two different ways.
In the ML family of languages, a functor is a module that takes one or more other modules as a parameter. It's considered an advanced feature, and most beginning programmers have difficulty with i...
val-mutable versus var-immutable in Scala
...our possibilities (val and var, mutable and immutable), this one makes the least sense. I do often use val mutable.
– Jim Pivarski
Sep 11 '13 at 1:14
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Where do I find the line number in the Xcode editor?
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Thanks, I will use that at least some of the time. But what I really want is to just display the number of the line I am on.
– William Jockusch
May 5 '11 at 17:27
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