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How to explain callbacks in plain english? How are they different from calling one function from ano
...of integer 4 in "a" parameter, the callback_funct will return 6 as result. Read this callbackhell.com best source I found.
– Dung
Nov 1 '17 at 10:03
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What is the correct SQL type to store a .Net Timespan with values > 24:00:00?
...tetime or datetimeoffset, that stores the result of first date + timespan. Reading from the db is a matter of TimeSpan x = SecondDate - FirstDate. Using this option will protect you for other non .NET data access libraries access the same data but not understanding TimeSpans; in case you have such a...
How do I make a text input non-editable?
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<input type="text" value="3" class="field left" readonly>
No styling necessary.
See <input> on MDN https://developer.mozilla.org/en/docs/Web/HTML/Element/input#Attributes
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Byte[] to InputStream or OutputStream
...rce = ...;
ByteArrayInputStream bis = new ByteArrayInputStream(source);
// read bytes from bis ...
ByteArrayOutputStream bos = new ByteArrayOutputStream();
// write bytes to bos ...
byte[] sink = bos.toByteArray();
Assuming that you are using a JDBC driver that implements the standard JDBC Blob i...
How to check if a json key exists?
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just before read key check it like before read
JSONObject json_obj=new JSONObject(yourjsonstr);
if(!json_obj.isNull("club"))
{
//it's contain value to be read operation
}
else
{
//it's not contain key club or isnull so do this opera...
Writing to an Excel spreadsheet
I am new to Python. I need to write some data from my program to a spreadsheet. I've searched online and there seem to be many packages available (xlwt, XlsXcessive, openpyxl). Others suggest to write to a .csv file (never used CSV and don't really understand what it is).
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Why does volatile exist?
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volatile is needed if you are reading from a spot in memory that, say, a completely separate process/device/whatever may write to.
I used to work with dual-port ram in a multiprocessor system in straight C. We used a hardware managed 16 bit value as a se...
Send a file via HTTP POST with C#
I've been searching and reading around to that and couldn't fine anything really useful.
8 Answers
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Haskell composition (.) vs F#'s pipe forward operator (|>)
...e appears on the left (see here).
(Personally, I find points-free style unreadable, but I suppose every new/different thing seems unreadable until you become accustomed to it.)
I think both are potentially viable in either language, and history/culture/accident may define why each community settle...
R command for setting working directory to source file location in Rstudio
...uments/proyect1").
Once you set that, you can navigate to a subdirectory: read.csv("DATA/mydata.csv"). Is the same as read.csv("D:/Documents/proyect1/DATA/mydata.csv").
If you want to navigate to a parent folder, you can use "../".
For example: read.csv("../olddata/DATA/mydata.csv") which is the ...