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How can I add to List
..., but you can't.
The wildcard declaration of List<? extends Number> foo3 means that the variable foo3 can hold any value from a family of types (rather than any value of a specific type). It means that any of these are legal assignments:
List<? extends Number> foo3 = new ArrayList<N...
Run function from the command line
...
With the -c (command) argument (assuming your file is named foo.py):
$ python -c 'import foo; print foo.hello()'
Alternatively, if you don't care about namespace pollution:
$ python -c 'from foo import *; print hello()'
And the middle ground:
$ python -c 'from foo import hello;...
How to use Swift @autoclosure
...look at example
func testClosures() {
//closures
XCTAssertEqual("fooWithClosure0 foo0", fooWithClosure0(p: foo0))
XCTAssertEqual("fooWithClosure1 foo1 1", fooWithClosure1(p: foo1))
XCTAssertEqual("fooWithClosure2 foo2 3", fooWithClosure2(p: foo2))
XCTAssertEqual("fooWithClosur...
What does auto&& tell us?
...n invalid state.
Now let's apply this to the case of auto&& var = foo();, as given in your question, where foo returns a T by value. In this case we know for sure that the type of var will be deduced as T&&. Since we know for certain that it's an rvalue, we don't need std::forward's...
Create a custom callback in JavaScript
... // Call the callback
callback('stuff', 'goes', 'here');
}
function foo(a, b, c) {
// I'm the callback
alert(a + " " + b + " " + c);
}
doSomething(foo);
That will call doSomething, which will call foo, which will alert "stuff goes here".
Note that it's very important to pass the f...
Why can I change value of a constant in javascript
...ist" that the constant points to.
So this works fine:
const x = {};
x.foo = 'bar';
console.log(x); // {foo : 'bar'}
x.foo = 'bar2';
console.log(x); // {foo : 'bar2'}
and this:
const y = [];
y.push('foo');
console.log(y); // ['foo']
y.unshift("foo2");
console.log(y); // ['foo2', 'f...
How do I find files that do not contain a given string pattern?
... out the files in the current directory which do not contain the word foo (using grep )?
16 Answers
...
How does having a dynamic variable affect performance?
...
void M()
{
dynamic d1 = whatever;
dynamic d2 = d1.Foo();
then the compiler will generate code that is morally like this. (The actual code is quite a bit more complex; this is simplified for presentation purposes.)
class C
{
static DynamicCallSite FooCallSite;
void...
How can I iterate over an enum?
...
The typical way is as follows:
enum Foo {
One,
Two,
Three,
Last
};
for ( int fooInt = One; fooInt != Last; fooInt++ )
{
Foo foo = static_cast<Foo>(fooInt);
// ...
}
Please note, the enum Last is meant to be skipped by the iteration. Utili...
Does Typescript support the ?. operator? (And, what's it called?)
...
Not as nice as a single ?, but it works:
var thing = foo && foo.bar || null;
You can use as many && as you like:
var thing = foo && foo.bar && foo.bar.check && foo.bar.check.x || null;
...