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JavaScript “new Array(n)” and “Array.prototype.map” weirdness
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@TrevNorris, you can easily test that with hasOwnProperty unless hasOwnProperty itself has a bug: (new Array(1)).hasOwnProperty(0) === false and [undefined].hasOwnProperty(0) === true. In fact, you can do the exact same with in: 0 in [undefined] === tru...
Checking if an object is null in C#
... Luca, you can also avoid equality overrides by casting to 'object' in the test. On a similar vein, this answer should claim this instead: "if((object)data != null)" since it avoids errors when equality has been overriden.
– DAG
Mar 11 '18 at 20:16
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Google Guava isNullOrEmpty for collections
...ons.collection the methods isEmpty() and isNotEmpty() still exist in the latest version. collections15.CollectionUtils seems like an independent project trying to provide generic support.
– proko
Aug 13 '12 at 13:18
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Handlebars/Mustache - Is there a built in way to loop through the properties of an object?
... {{this}}
{{/each}}
Note that only properties passing the hasOwnProperty test will be enumerated.
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How to exit from Python without traceback?
...ystemExit:
import os
os._exit(1)
I do this, in code that runs under unittest and calls fork(). Unittest gets when the forked process raises SystemExit. This is definitely a corner case!
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How to concatenate properties from multiple JavaScript objects
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@Juan I believe you are incorrect, and I did some tests to make up my mind. Caching the length is an easy myth of optimization that's been obsolete for many years, and it makes the code (slightly) less readable. Actually, caching the length sometimes slows down the browser (...
What is the $$hashKey added to my JSON.stringify result
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Are there any performance tests about «track by» vs «$$hashKey»? (UPD. Ok, I've googled it and «track by» is more preferrable)
– artuska
Sep 17 '15 at 14:25
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Build Error - missing required architecture i386 in file
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in additionally, test it on iOS Device instead of Simulator.
– Raptor
Nov 1 '11 at 9:51
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How do I use PHP namespaces with autoload?
...the sub directory for each namespace you are defined.
File: /ProjectRoot/test.php
define('BASE_PATH', realpath(dirname(__FILE__)));
function my_autoloader($class)
{
$filename = BASE_PATH . '/lib/' . str_replace('\\', '/', $class) . '.php';
include($filename);
}
spl_autoload_register('my_a...
How can I wrap text in a label using WPF?
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Yes, this does work—I tested it before I published my answer. You are right in that the elements targeted are not in the logical tree, but it's the visual tree that matters here.
– PaulJ
Aug 16 '13 at 13:15
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