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Mimicking sets in JavaScript?
...arrayLikeObject) // adds anything that a subclass returns true on _isPseudoArray()
// s.remove(key) // removes a key from the Set
// s.remove(["a", "b"]); // removes all keys in the passed in array
// s.remove("a", "b", ["first", "second"]); // removes all keys...
Disable cache for some images
...ading on the fly generated php chart image, and controlling the page with $_GET parameters. I wanted the image to be read from cache when the URL GET parameter stays the same, and do not cache when the GET parameters change.
To solve this problem, I needed to hash $_GET but since it is array here i...
Objective-C: Property / instance variable in category
...ey;
@implementation MyClass
- (NSString *)test {
NSString *result = objc_getAssociatedObject(self, &MyClassResultKey);
if (result == nil) {
// do a lot of stuff
result = ...;
objc_setAssociatedObject(self, &MyClassResultKey, result, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
...
Instance variables vs. class variables in Python
...test:
import timeit
setup='''
XGLOBAL= 5
class A:
xclass = 5
def __init__(self):
self.xinstance = 5
def f1(self):
xlocal = 5
x = self.xinstance
def f2(self):
xlocal = 5
x = A.xclass
def f3(self):
xlocal = 5
x = XGLOBAL
...
Sending files using POST with HttpURLConnection
...nn.connect();
if (conn.getResponseCode() == HttpURLConnection.HTTP_OK) {
return readStream(conn.getInputStream());
}
} catch (Exception e) {
Log.e(TAG, "multipart post error " + e + "(" + urlString + ")");
}
return null;
}
private static Str...
Why is string concatenation faster than array join?
...tenation:
// ECMA-262, section 15.5.4.6
function StringConcat() {
if (IS_NULL_OR_UNDEFINED(this) && !IS_UNDETECTABLE(this)) {
throw MakeTypeError("called_on_null_or_undefined", ["String.prototype.concat"]);
}
var len = %_ArgumentsLength();
var this_as_string = TO_STRING_INLINE(t...
Can't start Eclipse - Java was started but returned exit code=13
... answered Jan 3 '17 at 10:54
tk_tk_
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...
Explanation of strong and weak storage in iOS5
...lse". It's the "someone else" that is important.
Consider the following:
__strong id strongObject = <some_object>;
__weak id weakObject = strongObject;
Now we've got a two pointers to <some_object>, one strong and one weak. If we set strongObject to nil like so:
strongObject = nil;
...
How can I get a list of all functions stored in the database of a particular schema in PostgreSQL?
...
SELECT n.nspname as "Schema", p.proname as "Name", pg_catalog.pg_get_function_result(p.oid) as "Result data type", pg_catalog.pg_get_function_arguments(p.oid) as "Argument data types", CASE WHEN p.proisagg THEN 'agg' WHEN p.proiswindow THEN 'window' WHEN p.prorettype =...
Generate random numbers with a given (numerical) distribution
...
scipy.stats.rv_discrete might be what you want. You can supply your probabilities via the values parameter. You can then use the rvs() method of the distribution object to generate random numbers.
As pointed out by Eugene Pakhomov in th...