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Java system properties and environment variables
... System.grtProperties() lists all properties, and those set from command line will be there, but there's no way to distinguish those from the other properties added by the system, if that's what you're asking.
– Bohemian♦
Jul 25 '13 at 10:13
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How to test an Internet connection with bash?
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Gives a false alarm if run from a virtualization guest while the host is not connected.
– Teresa e Junior
Mar 26 '17 at 3:50
1
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How do I import the Django DoesNotExist exception?
... - before it is passed to assertRaises. You need to separate the arguments from the callable, as described in the unittest documentation:
self.assertRaises(Answer.DoesNotExist, Answer.objects.get, body__exact='<p>User can reply to discussion.</p>')
or better:
with self.assertRaises(A...
Google Maps v3 - limit viewable area and zoom level
...el);
});
</script>
</body>
</html>
Screenshot from the above example. The user will not be able to drag further south or far east in this case:
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Static variable inside of a function in C
...ists. If x were defined without the keyword static, the lifetime would be from the entry into foo() to the return from foo(); so it would be re-initialized to 5 on every call.
The keyword static acts to extend the lifetime of a variable to the lifetime of the programme; e.g. initialization occurs ...
In what situations would AJAX long/short polling be preferred over HTML5 WebSockets?
...n to the server, sends request headers with optional data, gets a response from the server, and closes the connection.
Supported in all major browsers.
Long poll - request → wait → response. Creates a connection to the server like AJAX does, but maintains a keep-alive connection open for some t...
Remove all elements contained in another array
I am looking for an efficient way to remove all elements from a javascript array if they are present in another array.
14 A...
Best way to store date/time in mongodb
..., for example.
If you need to, you can easily convert Date objects to and from Unix timestamps1), using the getTime() method and Date(milliseconds) constructor, respectively.
1) Strictly speaking, the Unix timestamp is measured in seconds. The JavaScript Date object measures in milliseconds since ...
How to filter NSFetchedResultsController (CoreData) with UISearchDisplayController/UISearchBar
... table view it will query and which applicable FRC to pull the information from. The FRC delegate methods must also figure out which tableView to update.
It is surprising how much of this is boilerplate code.
Relevant bits of the header file:
@interface BlahViewController : UITableViewController...
How to check if a file exists from inside a batch file [duplicate]
...
Try something like the following example, quoted from the output of IF /? on Windows XP:
IF EXIST filename. (
del filename.
) ELSE (
echo filename. missing.
)
You can also check for a missing file with IF NOT EXIST.
The IF command is quite powerful. The output ...