大约有 23,000 项符合查询结果（耗时：0.0290秒） [XML]
What is the difference between a var and val definition in Scala?
...B(n: Int) {
val value = new A(n)
}
object Test {
def main(args: Array[String]) {
val x = new B(5)
x = new B(6) // Doesn't work, because I can't replace the object created on the line above with this new one.
x.value = new A(6) // Doesn't work, because I can't replace the object assi...
What values should I use for CFBundleVersion and CFBundleShortVersionString?
...
Think of it this way: The "short version" (CFBundleShortVersionString) is the public version number. The "version" (CFBundleVersion) is more of an internal version number that could change far more frequently than the public "short version". Personally I use the same for both but many pe...
Calculate business days
...ll only get a rough standard.
/**
* National American Holidays
* @param string $year
* @return array
*/
public static function getNationalAmericanHolidays($year) {
// January 1 - New Year’s Day (Observed)
// Calc Last Monday in May - Memorial Day strtotime("last Monday of May 201...
Why does Typescript use the keyword “export” to make classes and interfaces public?
...able class, you then import it into other files export class User { name: string } Another file: import {User} from ""./the_file_path_to_the_user_class; see section 3.3 of the nativescript docs here docs.nativescript.org/angular/tutorial/ng-chapter-3
– Adam Diament
...
Will Dart support the use of existing JavaScript libraries?
...-beta.6)
Make JS classes and functions available to Dart like:
@JS("JSON.stringify")
external String stringify(obj);
@JS('google.maps')
library maps;
// Invokes the JavaScript getter `google.maps.map`.
external Map get map;
// `new Map` invokes JavaScript `new google.maps.Map(location)`
@JS(...
Matplotlib scatterplot; colour as a function of a third variable
...
In matplotlib grey colors can be given as a string of a numerical value between 0-1.
For example c = '0.1'
Then you can convert your third variable in a value inside this range and to use it to color your points.
In the following example I used the y position of the ...
What does the JSLint error 'body of a for in should be wrapped in an if statement' mean?
...is name (key, index) value pairs, where the value can be any other object (strings are objects too)
So,
new Array() is the same as []
new Object() is roughly similar to {}
var myarray = [];
Creates a structure that is an array with the restriction that all indexes (aka keys) must be a whole num...
Class method decorator with self arguments?
...t reads the attribute off of that. You can pass in the attribute name as a string to the decorator and use getattr if you don't want to hardcode the attribute name:
def check_authorization(attribute):
def _check_authorization(f):
def wrapper(self, *args):
print getattr(self,...
How do you get a Golang program to print the line number of the error it just called?
...es me to have to create a variable for it, why can't there be a log.Fatal("string", log.Flag). But creating a new variable log did work. Is it a standard thing to create log variables and stuff?
– Pinocchio
Jul 17 '14 at 19:01
...
Create Django model or update if exists
...a value that evaluates
to True (i.e., a value other than None or the empty string), Django
executes an UPDATE. If the object’s primary key attribute is not set
or if the UPDATE didn’t update anything, Django executes an INSERT.
It's worth noting that when they say 'if the UPDATE didn't update a...