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How to “EXPIRE” the “HSET” child key in redis?
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You can make this more efficient by using Array.filter to create an array of keys to delete from the hash then pass that to client.hdel(HASH_NAME, ...keys) in a single call.
– doublesharp
Jan 1 '19 at 18:50
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Get the client IP address using PHP [duplicate]
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$ipaddress = 'UNKNOWN';
return $ipaddress;
}
$_SERVER is an array that contains server variables created by the web server.
// Function to get the client IP address
function get_client_ip() {
$ipaddress = '';
if (isset($_SERVER['HTTP_CLIENT_IP']))
$ipaddress = $_SERVE...
How to store custom objects in NSUserDefaults
... NSKeyedArchiver rocks... seems it even automatically descends into NSArray or NSDictionary objects and encodes any encodable custom objects within.
– BadPirate
Apr 30 '12 at 16:54
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How do I tokenize a string in C++?
... as it still uses a string literal which is the plain C constant character array. I believe the questioner was asking if he could tokenize a C++ string which is of type "string" introduced by the latter.
– Vijay Kumar Kanta
Apr 19 '17 at 7:05
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Sending and Parsing JSON Objects in Android [closed]
...ot really anything to JSON. Curly brackets are for "objects" (associative arrays) and square brackets are for arrays without keys (numerically indexed). As far as working with it in Android, there are ready made classes for that included in the sdk (no download required).
Check out these classes:...
Programmatic equivalent of default(Type)
...arching this question - there's also an equivalent method if you wanted an array of the given type, and you can get it by using Array.CreateInstance(type, length).
– Darrel Hoffman
Jun 30 '13 at 1:34
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How to JSON serialize sets?
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JSON notation has only a handful of native datatypes (objects, arrays, strings, numbers, booleans, and null), so anything serialized in JSON needs to be expressed as one of these types.
As shown in the json module docs, this conversion can be done automatically by a JSONEncoder and JSON...
Why no generics in Go?
...lly with any type". That's what we also call generics. Eg the length of an array doesn't depend on what's in the array. See https://news.ycombinator.com/item?id=23560798.
The earliest that generics could be added to Go would be the Go 1.17 release, scheduled for August 2021. See https://blog.golang....
Should try…catch go inside or outside a loop?
...you are treating a single iteration of the loop, or a single element in an array as a whole "unit". If an exception in that "unit" occurs, we just skip that element and then we continue on to the next iteration of the loop.
– Galaxy
Oct 16 '18 at 1:50
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Importing data from a JSON file into R
... to import data from a JSON file into R? More specifically, the file is an array of JSON objects with string fields, objects, and arrays. The RJSON Package isn't very clear on how to deal with this http://cran.r-project.org/web/packages/rjson/rjson.pdf .
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