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Convert array of strings into a string in Java
...arr) {
builder.append(s);
}
String str = builder.toString();
(Java 8 and above):
String str = String.join(",", arr);
And if you're coming from the Android angle:
String str = TextUtils.join(",", arr);
You can modify the above depending on what characters, if any, you want in between stri...
Test if object implements interface
...eding to cast afterward with the first one thus giving you two casts ("is" and then an explicit cast). With the second approach you only cast once.
– Andrew Hare
Jan 4 '09 at 6:02
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How to find out what type of a Mat object is with Mat::type() in OpenCV
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Here is a handy function you can use to help with identifying your opencv matrices at runtime. I find it useful for debugging, at least.
string type2str(int type) {
string r;
uchar depth = type & CV_MAT_DEPTH_MASK;
uchar cha...
Selecting text in an element (akin to highlighting with your mouse)
...nd a solution for this in this thread. I was able to modify the info given and mix it with a bit of jQuery to create a totally awesome function to select the text in any element, regardless of browser:
function SelectText(element) {
var text = document.getElementById(element);
if ($.browser...
Django removing object from ManyToMany relationship
...jango's Relations Docs
Note: you might have to get an instance of my_mood and my_interest using Django's QuerySet API before you can execute this code.
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Struct inheritance in C++
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Other than what Alex and Evan have already stated, I would like to add that a C++ struct is not like a C struct.
In C++, a struct can have methods, inheritance, etc. just like a C++ class.
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Doing a cleanup action just before Node.js exits
...
UPDATE:
You can register a handler for process.on('exit') and in any other case(SIGINT or unhandled exception) to call process.exit()
process.stdin.resume();//so the program will not close instantly
function exitHandler(options, exitCode) {
if (op...
Difference between Covariance & Contra-variance
I am having trouble understanding the difference between covariance and contravariance.
5 Answers
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Downloading a large file using curl
... As @SashaChedygov has pointed out above, you don't need to use fwrite AND CURLOPT_FILE. Passing the $fp is enough. I did both and ended up with 1 at the end of content in the file.
– paperclip
Jan 30 '13 at 21:00
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Print list without brackets in a single row
...in(names))
This, like it sounds, just takes all the elements of the list and joins them with ', '.
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