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How do you rotate a two dimensional array?
Inspired by Raymond Chen's post , say you have a 4x4 two dimensional array, write a function that rotates it 90 degrees. Raymond links to a solution in pseudo code, but I'd like to see some real world stuff.
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Test for existence of nested JavaScript object key
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function checkNested(obj /*, level1, level2, ... levelN*/) {
var args = Array.prototype.slice.call(arguments, 1);
for (var i = 0; i < args.length; i++) {
if (!obj || !obj.hasOwnProperty(args[i])) {
return false;
}
obj = obj[args[i]];
}
return true;
}
var test = {level...
Socket.IO - how do I get a list of connected sockets/clients?
... Socket.IO 0.7 you have a clients method on the namespaces, this returns a array of all connected sockets.
API for no namespace:
var clients = io.sockets.clients();
var clients = io.sockets.clients('room'); // all users from room `room`
For a namespace
var clients = io.of('/chat').clients();
va...
How might I find the largest number contained in a JavaScript array?
I have a simple JavaScript Array object containing a few numbers.
28 Answers
28
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Given a class, see if instance has method (Ruby)
... because instance_methods changed between Ruby 1.8 and 1.9. 1.8 returns an array of strings and 1.9 returns an array of symbols. method_defined? takes a symbol in both 1.8 and 1.9.
– Jason
May 2 '12 at 17:03
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What does int argc, char *argv[] mean?
... virtually all implementations will prepend the name of the program to the array.
The variables are named argc (argument count) and argv (argument vector) by convention, but they can be given any valid identifier: int main(int num_args, char** arg_strings) is equally valid.
They can also be omitte...
Doctrine - How to print out the real sql, not just the prepared statement?
...dQueryTypes;
public function __construct(AbstractPlatform $dbPlatform, array $loggedQueryTypes=array()){
$this->dbPlatform=$dbPlatform;
$this->loggedQueryTypes=$loggedQueryTypes;
}
/**
* {@inheritdoc}
*/
public function startQuery($sql, array $params =...
Selecting multiple columns in a pandas dataframe
...also get columns. For example, df.ix[0:2, 0:2] gets the upper left 2x2 sub-array just like it does for a NumPy matrix (depending on your column names of course). You can even use the slice syntax on string names of the columns, like df.ix[0, 'Col1':'Col5']. That gets all columns that happen to be or...
What is the easiest way to initialize a std::vector with hardcoded elements?
I can create an array and initialize it like this:
29 Answers
29
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Understanding slice notation
... start through stop-1
a[start:] # items start through the rest of the array
a[:stop] # items from the beginning through stop-1
a[:] # a copy of the whole array
There is also the step value, which can be used with any of the above:
a[start:stop:step] # start through not past s...