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What is the difference between declarative and imperative programming? [closed]
...he SQL "compiler" can "optimize" this query because it knows that id is an indexed field -- or maybe it isn't indexed, in which case it will have to iterate over the entire data set anyway. Or maybe the SQL engine knows that this is the perfect time to utilize all 8 cores for a speedy parallel sear...
How to merge a specific commit in Git
..., you can do an actual git merge --no-commit, and then manually adjust the index to remove any changes you don't want.
Suppose you're on branch A and you want to merge the commit at the tip of branch B:
git checkout A
git merge --no-commit B
Now you're set up to create a commit with two parents,...
Is there a way to chain multiple value converters in XAML?
... {
if (_parameters == null)
return null;
var index = IndexOf(converter as IValueConverter);
string parameter;
try
{
parameter = _parameters[index];
}
catch (IndexOutOfRangeException ex)
{
paramete...
How to create ASP.NET Web API Url?
...owing:
public class HomeController : Controller
{
public ActionResult Index()
{
string url = Url.RouteUrl(
"DefaultApi",
new { httproute = "", controller = "values", id = "123" }
);
return View();
}
}
or inside a view:
<script type=...
Grouped LIMIT in PostgreSQL: show the first N rows for each group?
...est's answer is the way to go. Just dont forget to spice ti up with proper indexing.
– Diligent Key Presser
Jun 20 '19 at 8:46
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Why .NET String is immutable? [duplicate]
...ample, if you were implementing list which was backed by an array, a start index and a count, then the most expensive part of creating a sub-range would be copying the objects. However, if it was immutable then the sub-range object could reference the same array, with only the start index and count ...
Insert a commit before the root commit in Git?
...st create a commit directly, which avoids touching the working copy or the index or which branch is checked out, etc.
Create a tree object for an empty directory:
tree=`git hash-object -wt tree --stdin < /dev/null`
Wrap a commit around it:
commit=`git commit-tree -m 'root commit' $tree`
Cre...
How to sort a dataframe by multiple column(s)
... 1
Edit some 2+ years later: It was just asked how to do this by column index. The answer is to simply pass the desired sorting column(s) to the order() function:
R> dd[order(-dd[,4], dd[,1]), ]
b x y z
4 Low C 9 2
2 Med D 3 1
1 Hi A 8 1
3 Hi A 9 1
R>
rather than using the name of...
How does a garbage collector avoid an infinite loop here?
...nown>:0
at System.IO.StreamWriter.Write (System.Char[] buffer, Int32 index, Int32 count) [0x00000] in <filename unknown>:0
at System.IO.CStreamWriter.Write (System.Char[] buffer, Int32 index, Int32 count) [0x00000] in <filename unknown>:0
at System.IO.CStreamWriter.Write (Sys...
Using :before CSS pseudo element to add image to modal
I have a CSS class Modal which is absolutely positioned, z-indexed above it's parent, and nicely positioned with JQuery. I want to add a caret image (^) to the top of the modal box and was looking at using the :before CSS pseudo selector to do this cleanly.
...