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How to generate unique ID with node.js
...on generate(count, k) {
var _sym = 'abcdefghijklmnopqrstuvwxyz1234567890',
var str = '';
for(var i = 0; i < count; i++) {
str += _sym[parseInt(Math.random() * (_sym.length))];
}
base.getID(str, function(err, res) {
if(!res.length) {
k(str) ...
Prevent user from seeing previously visited secured page after logout
...; // HTTP 1.1.
response.setHeader("Pragma", "no-cache"); // HTTP 1.0.
response.setDateHeader("Expires", 0); // Proxies.
chain.doFilter(req, res);
}
// ...
}
Map this Filter on an url-pattern of interest, for example *.jsp.
@WebFilter("*.jsp")
Or if you want to ...
Calling Java varargs method with single null argument?
...method foo(Object ...arg) and I call foo(null, null) , I have both arg[0] and arg[1] as null s. But if I call foo(null) , arg itself is null. Why is this happening?
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Why is printing “B” dramatically slower than printing “#”?
I generated two matrices of 1000 x 1000 :
3 Answers
3
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How to convert nanoseconds to seconds using the TimeUnit enum?
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201
Well, you could just divide by 1,000,000,000:
long elapsedTime = end - start;
double seconds =...
Convert data.frame columns from factors to characters
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370
Just following on Matt and Dirk. If you want to recreate your existing data frame without chang...
Remove blank lines with grep
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308
Try the following:
grep -v -e '^$' foo.txt
The -e option allows regex patterns for matching....
Is it possible to install APK file if more than one emulators/devices are connected [duplicate]
...
answered Aug 25 '11 at 7:04
Mohammed Azharuddin ShaikhMohammed Azharuddin Shaikh
38.6k1313 gold badges8989 silver badges113113 bronze badges
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Android Fragment lifecycle over orientation changes
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190
You're layering your Fragments one on top of the other.
When a config change occurs the old Fra...
Tool for adding license headers to source files? [closed]
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edited Mar 22 '16 at 22:06
joshperry
36.7k1414 gold badges8181 silver badges9797 bronze badges
answere...