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Is there a difference between “==” and “is”?
... most cases this logic is true, but it relies on the implementation of the __eq__ special method. As the docs say,
The default behavior for equality comparison (== and !=) is based on
the identity of the objects. Hence, equality comparison of instances
with the same identity results in equa...
How to determine whether code is running in DEBUG / RELEASE build?
...n though. You may see DEBUG changed to another variable name such as DEBUG_MODE.
then conditionally code for DEBUG in your source files
#ifdef DEBUG
// Something to log your sensitive data here
#else
//
#endif
sha...
Best practices with STDIN in Ruby?
...ual file that gets all input from named files or all from STDIN.
ARGF.each_with_index do |line, idx|
print ARGF.filename, ":", idx, ";", line
end
# print all the lines in every file passed via command line that contains login
ARGF.each do |line|
puts line if line =~ /login/
end
Thank goo...
How to round a number to significant figures in Python
...t digit:
>>> from math import log10, floor
>>> def round_to_1(x):
... return round(x, -int(floor(log10(abs(x)))))
...
>>> round_to_1(0.0232)
0.02
>>> round_to_1(1234243)
1000000.0
>>> round_to_1(13)
10.0
>>> round_to_1(4)
4.0
>>> rou...
Can comments be used in JSON?
...hen it will be data too.
You could have a designated data element called "_comment" (or something) that would be ignored by apps that use the JSON data.
You would probably be better having the comment in the processes that generates/receives the JSON, as they are supposed to know what the JSON dat...
Why does ++[[]][+[]]+[+[]] return the string “10”?
...
+(true) + '' + (0)
1 + '' + 0
"10"
So now you got that, try this one:
_=$=+[],++_+''+$
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How to remove an item from an array in AngularJS scope?
...te</a>
Controller:
$scope.delete = function ( idx ) {
var person_to_delete = $scope.persons[idx];
API.DeletePerson({ id: person_to_delete.id }, function (success) {
$scope.persons.splice(idx, 1);
});
};
...
Can iterators be reset in Python?
...r protocol is very simple, and only provides one single method (.next() or __next__()), and no method to reset an iterator in general.
The common pattern is to instead create a new iterator using the same procedure again.
If you want to "save off" an iterator so that you can go back to its beginni...
How can we match a^n b^n with Java regex?
... testAll($r, $tests) {
foreach ($tests as $test) {
$isMatch = preg_match($r, $test, $groups);
$groupsJoined = join('|', $groups);
print("$test $isMatch $groupsJoined\n");
}
}
$tests = array('aaa', 'aaab', 'aaaxb', 'xaaab', 'b', 'abbb');
$r1 = '/^a+(?=b+)/';
# └...
Convert a PHP object to an associative array
...ect
$object = new StdClass;
$object->foo = 1;
$object->bar = 2;
var_dump( (array) $object );
Output:
array(2) {
'foo' => int(1)
'bar' => int(2)
}
Example: Complex Object
class Foo
{
private $foo;
protected $bar;
public $baz;
public function __construct()
...