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What does a tilde do when it precedes an expression?
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~ is a bitwise operator that flips all bits in its operand.
For example, if your number was 1, its binary representation of the IEEE 754 float (how JavaScript treats numbers) would be...
0011 1111 1111 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000
So ~ converts its op...
How large should my recv buffer be when calling recv in the socket library
...at can hold the largest individual message / command you would reasonably expect (3000 is likely fine). If your protocol is transferring bulk data, then larger buffers can be more efficient - a good rule of thumb is around the same as the kernel receive buffer size of the socket (often something ar...
Subtract days from a date in JavaScript
...s anybody know of an easy way of taking a date (e.g. Today) and going back X days?
32 Answers
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There is already an open DataReader associated with this Command which must be closed first
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This can happen if you execute a query while iterating over the results from another query. It is not clear from your example where this happens because the example is not complete.
One thing that can cause this is lazy loading triggered when itera...
What does @@variable mean in Ruby?
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A variable prefixed with @ is an instance variable, while one prefixed with @@ is a class variable. Check out the following example; its output is in the comments at the end of the puts lines:
class Test
@@shared = 1
def value
@@sh...
Send response to all clients except sender
...e sender
io.emit('message', "this is a test");
// sending to all clients except sender
socket.broadcast.emit('message', "this is a test");
// sending to all clients in 'game' room(channel) except sender
socket.broadcast.to('game').emit('message', 'nice game');
// sending to all clients in 'game' ...
How to split one string into multiple strings separated by at least one space in bash shell?
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set $text [this will put the words into $1,$2,$3...etc]
– Rajesh
Apr 9 '14 at 2:40
35
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How to resize a tableHeaderView of a UITableView?
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Perfect, thanks a bunch. To me, this is an example of one of the less desirable qualities of properties in Objective-C. There's no way for us to know (and no reason we should know) that setting the header has the side effect of recalculating the height. It should eithe...
How does Python 2 compare string and int? Why do lists compare as greater than numbers, and tuples g
...n 2 manual:
CPython implementation detail: Objects of different types except numbers are ordered by their type names; objects of the same types that don’t support proper comparison are ordered by their address.
When you order two strings or two numeric types the ordering is done in the expec...
jQuery $.ajax(), $.post sending “OPTIONS” as REQUEST_METHOD in Firefox
...e reason for the error is the same origin policy. It only allows you to do XMLHTTPRequests to your own domain. See if you can use a JSONP callback instead:
$.getJSON( 'http://<url>/api.php?callback=?', function ( data ) { alert ( data ); } );
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