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Why is my variable unaltered after I modify it inside of a function? - Asynchronous code reference
...being assigned or passed as an argument. That is what we call a callback.
Now the question is, when is that callback called?
It depends on the case. Let's try to trace some common behavior again:
img.onload may be called sometime in the future, when (and if) the image has successfully loaded.
se...
What does the “map” method do in Ruby?
..., convert each element by some rule
names.map! {|name| name.capitalize } # now names contains ['Danil', 'Edmund']
names.each { |name| puts name + ' is a programmer' } # here we just do something with each element
The output:
Danil is a programmer
Edmund is a programmer
...
Unicode equivalents for \w and \b in Java regular expressions?
...t also sports corrected definitions for various other properties, too. It now tracks The Unicode Standard, in both RL1.2 and RL1.2a from UTS#18: Unicode Regular Expressions. This is an exciting and dramatic improvement, and the development team is to be commended for this important effort.
Java...
How to create an installer for a .net Windows Service using Visual Studio
...operties as you need such as service name and user that it should run as.
Now you need to make a setup project. The best thing to do is use the setup wizard.
Right click on your solution and add a new project: Add > New Project > Setup and Deployment Projects > Setup Wizard
a. This could ...
SQlite Getting nearest locations (with latitude and longitude)
...w PointF((float) lat, (float) lon);
return newPoint;
}
And now create your query:
PointF center = new PointF(x, y);
final double mult = 1; // mult = 1.1; is more reliable
PointF p1 = calculateDerivedPosition(center, mult * radius, 0);
PointF p2 = calculateDerivedPosition(center, mul...
Assign one struct to another in C
...truct S {
char * p;
};
struct S s1, s2;
s1.p = malloc(100);
s2 = s1;
Now the pointers of both structs point to the same block of memory - the compiler does not copy the pointed to data. It is now difficult to know which struct instance owns the data. This is why C++ invented the concept of use...
How to convert a LocalDate to an Instant?
...for you automatically, so you must provide it.
LocalDate date = LocalDate.now();
Instant instant = date.atStartOfDay(ZoneId.systemDefault()).toInstant();
This example uses the default time-zone of the JVM - ZoneId.systemDefault() - to perform the conversion. See here for a longer answer to a rela...
How do I create test and train samples from one dataframe with pandas?
...
Btw, it does return a Pandas Dataframe now (just tested on Sklearn 0.16.1)
– Julien Marrec
Jul 8 '15 at 10:30
12
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How do you make a HTTP request with C++?
...
Update 2020: I have a new answer that replaces this, now 8-years-old, one: https://stackoverflow.com/a/61177330/278976
On Linux, I tried cpp-netlib, libcurl, curlpp, urdl, boost::asio and considered Qt (but turned it down based on the license). All of these were either incompl...
How to override and extend basic Django admin templates?
... This answer was very good for the older Django versions. But as of now, Another answer by Cheng is more relevant. stackoverflow.com/a/29997719/7344164
– DevLoverUmar
Jul 15 at 5:12
...