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How to write a simple database engine [closed]
...HD thesis to have it answered 100% ;)
but we can think of the problems one by one:
How to store the data internally:
you should have a data file containing your database objects and a caching mechanism to load the data in focus and some data around it into RAM
assume you have a table, with some d...
How do you sort an array on multiple columns?
...
If owner names differ, sort by them. Otherwise, use publication name for tiebreaker.
function mysortfunction(a, b) {
var o1 = a[3].toLowerCase();
var o2 = b[3].toLowerCase();
var p1 = a[1].toLowerCase();
var p2 = b[1].toLowerCase();
if (o1...
Reference list item by index within Django template?
... imageUploader: {
brandingHtml: "Powered by \u003ca href=\"https://imgur.com/\"\u003e\u003csvg class=\"svg-icon\" width=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454...
Does Java have something like C#'s ref and out keywords?
...No, Java doesn't have something like C#'s ref and out keywords for passing by reference.
You can only pass by value in Java. Even references are passed by value. See Jon Skeet's page about parameter passing in Java for more details.
To do something similar to ref or out you would have to wrap your...
Fastest way to replace NAs in a large data.table
... this
identical(a_gdata, dt1)
[1] TRUE
Note that f_dowle updated dt1 by reference. If a local copy is required then an explicit call to the copy function is needed to make a local copy of the whole dataset. data.table's setkey, key<- and := do not copy-on-write.
Next, let's see where f_dow...
Is there a JavaScript / jQuery DOM change listener?
...ions, observer);
// ...
});
// define what element should be observed by the observer
// and what types of mutations trigger the callback
observer.observe(document, {
subtree: true,
attributes: true
//...
});
This example listens for DOM changes on document and its entire subtree, and it...
Saving vim macros
...
Use q followed by a letter to record a macro. This just goes into one of the copy/paste registers so you can paste it as normal with the "xp or "xP commands in normal mode.
To save it you open up .vimrc and paste the contents, then the reg...
Return array in a function
... be treated as a pointer to the beginning of your array's block in memory, by an implicit conversion. This syntax that you're using:
int fillarr(int arr[])
Is kind of just syntactic sugar. You could really replace it with this and it would still work:
int fillarr(int* arr)
So in the same sen...
What is the difference between quiet NaN and signaling NaN?
... In contrast, NaNs are for more normal programming. They can be produced by normal operations when there is no numerical result (e.g., taking the square root of a negative number when the result must be real). Their purpose is generally to allow arithmetic to proceed somewhat normally. E.g., you m...
check if jquery has been loaded, then load it if false
...text/javascript";
script.src = "path/to/jQuery";
document.getElementsByTagName('head')[0].appendChild(script);
}
</script>
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