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How do I create an average from a Ruby array?
How would get find an average from an array?
20 Answers
20
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What is the preferred syntax for defining enums in JavaScript?
...t.freeze(DaysEnum)
and voila! JS enums.
However, this doesn't prevent you from assigning an undesired value to a variable, which is often the main goal of enums:
let day = DaysEnum.tuesday
day = 298832342 // goes through without any errors
One way to ensure a stronger degree of type safety (with e...
Android Whatsapp/Chat Examples [closed]
...essenger for Android, this code should get you started somewhere.
Excerpt from the source :
This is a simple IM application runs on Android, application makes
http request to a server, implemented in php and mysql, to
authenticate, to register and to get the other friends' status and
data...
Maven: Non-resolvable parent POM
...anks I tried it for a while to solve the problem. I took the relative path from ../pom.xml to ../<parent folder>/pom.xml.
– Mario Kurzweil
Feb 4 '17 at 19:36
...
How do I find the caller of a method using stacktrace or reflection?
...{
return "Reflection";
}
}
/**
* Get a stack trace from the current thread
*/
private static class ThreadStackTraceMethod extends GetCallerClassNameMethod {
public String getCallerClassName(int callStackDepth) {
return Thread.currentThread().getStackTrac...
How to change string into QString?
...ing you mean std::string you can do it with this method:
QString QString::fromStdString(const std::string & str)
std::string str = "Hello world";
QString qstr = QString::fromStdString(str);
If by string you mean Ascii encoded const char * then you can use this method:
QString QString::fro...
Is AsyncTask really conceptually flawed or am I just missing something?
...destroyed which
triggered the task?
Manually disassociate the activity from the AsyncTask in onDestroy(). Manually re-associate the new activity to the AsyncTask in onCreate(). This requires either a static inner class or a standard Java class, plus perhaps 10 lines of code.
...
Pandas: create two new columns in a dataframe with values calculated from a pre-existing column
...mns to a dataframe df with n columns (n > 0).
These new columns result from the application of a function to one of the columns in the dataframe.
...
How can I strip the whitespace from Pandas DataFrame headers?
I am parsing data from an Excel file that has extra white space in some of the column headings.
3 Answers
...
How can I sharpen an image in OpenCV?
...ing:
You use a Gaussian smoothing filter and subtract the smoothed version from the original image (in a weighted way so the values of a constant area remain constant).
To get a sharpened version of frame into image: (both cv::Mat)
cv::GaussianBlur(frame, image, cv::Size(0, 0), 3);
cv::addWeighted(f...