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The difference between bracket [ ] and double bracket [[ ]] for accessing the elements of a list or
... x[[i]]
x[[i, j]]
x$a
x$"a"
For vectors and matrices the [[ forms are rarely used, although they have some slight semantic differences from the [ form (e.g. it drops any names or dimnames attribute, and that partial matching is used for character indices). When indexing multi-dimensio...
Differences between contentType and dataType in jQuery ajax function
...
From the documentation:
contentType (default: 'application/x-www-form-urlencoded; charset=UTF-8')
Type: String
When sending data to the server, use this content type. Default is "application/x-www-form-urlencoded; charset=UTF-8", which is fine for most cases. If you explicitly pass in a co...
Saving and Reading Bitmaps/Images from Internal memory in Android
... image to the OutputStream
bitmapImage.compress(Bitmap.CompressFormat.PNG, 100, fos);
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
fos.close();
} catch (IOException e) {
e.printStackTrace(...
Spring MVC: How to perform validation?
I would like to know what is the cleanest and best way to perform form validation of user inputs. I have seen some developers implement org.springframework.validation.Validator . A question about that: I saw it validates a class. Does the class have to be filled manually with the values from the us...
Commenting in a Bash script inside a multiline command
...need to be before the \ continuation.
Note that parameter expansion is performed inside the comment:
$ ls file
ls: cannot access 'file': No such file or directory
$ echo foo${IFS# This command will create file: $(touch file)}bar
foo bar
$ ls file
file
Rare exception
The only rare case this fail...
Import / Export database with SQL Server Server Management Studio
...te" from the context menu.
Make sure "Delete backup and restore history information for databases" check-box is checked.
Select "OK" to complete the deletion process.
Repeat the above steps for the "wtMaster" part of the database.
Right click on "Databases" and select "Restore Database..." from the...
Is there a difference between copy initialization and direct initialization?
...tion
While they look identical and are supposed to do the same, these two forms are remarkably different in certain cases. The two forms of initialization are direct and copy initialization:
T t(x);
T t = x;
There is behavior we can attribute to each of them:
Direct initialization behaves like...
Assigning code to a variable
...
@CSharpie Why couldn't the OP use this in WinForms?
– vivat pisces
Apr 16 '14 at 20:47
2
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When is memoization automatic in GHC Haskell?
...d yes, you are right about the original m1 and m2: versions of GHC that perform this kind of lifting with optimizations enabled will transform m2 into m1.
– Reid Barton
Oct 17 '10 at 15:36
...
Anyone else find naming classes and methods one of the most difficult parts in programming? [closed]
...classes, I scrutinize the function to see if its basic function is to transform one kind of thing into another kind of thing. I'm using that term very loosely, but you'll discover that a HUGE number of functions that you write essentially take something in one form and produce something in another f...