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How do I implement basic “Long Polling”?
I can find lots of information on how Long Polling works (For example, this , and this ), but no simple examples of how to implement this in code.
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When should null values of Boolean be used?
...a boolean value. For example, when using reflection or methods like MessageFormat.format().
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Node.js get file extension
...xtension that's expected is tar.gz but if you apply any function that give form 1st dot, it will not work as you can see
– Mohamed Allal
Feb 14 '18 at 23:06
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Loading local JSON file
...ileReader and JSON.parser (and no jquery).
<html>
<body>
<form id="jsonFile" name="jsonFile" enctype="multipart/form-data" method="post">
<fieldset>
<h2>Json File</h2>
<input type='file' id='fileinput'>
<input type='button' id='btnLoad'...
What is the optimal length for an email address in a database?
...As described in RFC3696 Errata ID 1690.
I got the original part of this information from here
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What are the differences between numpy arrays and matrices? Which one should I use?
... new @ operator). Thus, if a and b are numpy arrays, then a*b is the array
formed by multiplying the components element-wise:
c = np.array([[4, 3], [2, 1]])
d = np.array([[1, 2], [3, 4]])
print(c*d)
# [[4 6]
# [6 4]]
To obtain the result of matrix multiplication, you use np.dot (or @ in Python &...
Best way to do multiple constructors in PHP
... you can't easily define the exact constraints of a problem, like creating form elements. but then, that's just my opinion and for the record; I don't claim it to be fact.
– Kris
Nov 9 '09 at 16:24
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Why are quaternions used for rotations?
...using quaternions for rotations instead of writing things in matrix/vector form.
8 Answers
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C++ Const Usage Explanation
... them, always try to read them from right to left (after applying the transformation above). So in this case the return value is a const pointer to a const int. Making the pointer itself const makes no sense here since the return value isn't a lvalue that could be modified. Making the pointee const,...
ASP.NET Web API Authentication
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allow a user to log in to the API
You need to send a valid Forms Authentication cookie along with the request. This cookie is usually sent by the server when authenticating (LogOn action) by calling the [FormsAuthentication.SetAuthCookie method (see MSDN).
So the client needs to per...