大约有 6,261 项符合查询结果（耗时：0.0210秒） [XML]
Which is preferred: Nullable.HasValue or Nullable != null?
...nd to always use !=null
And this is why:
Let imagine we have some class Foo with a nullable double variable SomeDouble
public class Foo
{
public double? SomeDouble;
//some other properties
}
If somewhere in our code we want to get all Foo with a non null SomeDouble values from a col...
Twig ternary operator, Shorthand if-then-else
...
You can use shorthand syntax as of Twig 1.12.0
{{ foo ?: 'no' }} is the same as {{ foo ? foo : 'no' }}
{{ foo ? 'yes' }} is the same as {{ foo ? 'yes' : '' }}
share
|
impro...
AngularJS: ng-show / ng-hide not working with `{{ }}` interpolation
...
The foo.bar reference should not contain the braces:
<p ng-hide="foo.bar">I could be shown, or I could be hidden</p>
<p ng-show="foo.bar">I could be shown, or I could be hidden</p>
Angular expressions n...
How do I import other TypeScript files?
...ry.d.ts"/>
/// <reference path="components/someclass.ts"/>
class Foo { }
etc.
These paths are relative to the current file.
Your example:
/// <reference path="moo.ts"/>
class bar extends moo.foo
{
}
sh...
how to “reimport” module to python then code be changed after import
I have a foo.py
4 Answers
4
...
How do I perform a Perl substitution on a string while keeping the original?
...a string without changing the original:
(my $newstring = $oldstring) =~ s/foo/bar/g;
In perl 5.14.0 or later, you can use the new /r non-destructive substitution modifier:
my $newstring = $oldstring =~ s/foo/bar/gr;
Note: The above solutions work without g too. They also work with any other...
Why do you need to invoke an anonymous function on the same line?
...e is your basic declared function.
Ex. 1:
var message = 'SO';
function foo(msg) {
alert(msg);
}
foo(message);
Functions are objects, and can be grouped. So let's throw parens around the function.
Ex. 2:
var message = 'SO';
function foo(msg) { //declares foo
alert(msg);
}
(foo)(m...
Can Python test the membership of multiple values in a list?
...ant, and will work in nearly all cases:
>>> all(x in ['b', 'a', 'foo', 'bar'] for x in ['a', 'b'])
True
The expression 'a','b' in ['b', 'a', 'foo', 'bar'] doesn't work as expected because Python interprets it as a tuple:
>>> 'a', 'b'
('a', 'b')
>>> 'a', 5 + 2
('a', 7)
...
How to perform runtime type checking in Dart?
...tp://www.dartlang.org/articles/optional-types/.
Here's an example:
class Foo { }
main() {
var foo = new Foo();
if (foo is Foo) {
print("it's a foo!");
}
}
share
|
improve this answer
...
“Variable” variables in Javascript?
... your problem.
If you have a fixed set of names, such as
// BAD
var foo = 42;
var bar = 21;
var key = 'foo';
console.log(eval(key));
store the those name/values as properties of an object and use bracket notation to look them up dynamically:
// GOOD
var obj = {
foo: 42,
...