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Find XOR of all numbers in a given range
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This is a pretty clever solution -- it exploits the fact that there is a pattern of results in the running XORs. The f() function calculates the XOR total run from [0, a]. Take a look at this table for 4-bit numbers:
0000 <- 0 [a]
0001 <- 1 [1]
0010 &l...
How to programmatically send a 404 response with Express/Node?
...'s a dedicated status function for this on the response object. Just chain it in somewhere before you call send.
res.status(404) // HTTP status 404: NotFound
.send('Not found');
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Python hashable dicts
...are invalid, unless I also store the current version of the grammar along with the cached parse results. ( EDIT : a consequence of this use of key-value collections is that they should be immutable, but I don't intend to expose the interface to allow them to be changed, so either mutable or immutab...
REST API Token-based Authentication
...loping a REST API that requires authentication. Because the authentication itself occurs via an external webservice over HTTP, I reasoned that we would dispense tokens to avoid repeatedly calling the authentication service. Which brings me neatly to my first question:
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Get Specific Columns Using “With()” Function in Laravel Eloquent
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Well I found the solution. It can be done one by passing a closure function in with() as second index of array like
Post::with(array('user'=>function($query){
$query->select('id','username');
}))->get();
It will only select id...
How to read a single char from the console in Java (as the user types it)?
...e an easy way to read a single char from the console as the user is typing it in Java? Is it possible? I've tried with these methods but they all wait for the user to press enter key:
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Stop form refreshing page on submit
...o about preventing the page from refreshing when pressing the send button without any data in the fields?
20 Answers
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Why use String.Format? [duplicate]
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I can see a number of reasons:
Readability
string s = string.Format("Hey, {0} it is the {1}st day of {2}. I feel {3}!", _name, _day, _month, _feeling);
vs:
string s = "Hey," + _name + " it is the " + _day + "st day of " + _month + ". I feel " + feeling + "!"...
Zooming editor window android studio [duplicate]
...eem like a silly question but does anyone know how to zoom in/out of the editor window in android studio? I have actually researched it before people give me minus marks. Ctrl+ and Ctrl- seem to fold and unfold methods, there is no zoom control in the view drop-down and all the googleing ive done h...
Best documentation for Boost:asio?
The documentation available on the boost website is... limited.
9 Answers
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