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What are all the uses of an underscore in Scala?
...
The ones I can think of are
Existential types
def foo(l: List[Option[_]]) = ...
Higher kinded type parameters
case class A[K[_],T](a: K[T])
Ignored variables
val _ = 5
Ignored parameters
List(1, 2, 3) foreach { _ => println("Hi") }
Ignored names of self types
...
Java: Multiple class declarations in one file
...ice but allowed by the spec. I would urge people not to write public int[] foo(int x)[] { return new int[5][5]; } as well, even though that's valid.)
– Jon Skeet
Apr 6 '15 at 15:50
...
How to interpolate variables in strings in JavaScript, without concatenation?
...out escaping, which is great for templates:
return `
<div class="${foo}">
...
</div>
`;
Browser support:
As this syntax is not supported by older browsers (mostly Internet Explorer), you may want to use Babel/Webpack to transpile your code into ES5 to ensure it will ...
How do I convert a String to an int in Java?
...
String myString = "1234";
int foo = Integer.parseInt(myString);
If you look at the Java documentation you'll notice the "catch" is that this function can throw a NumberFormatException, which of course you have to handle:
int foo;
try {
foo = Integer.p...
A Java API to generate Java source files [closed]
...his code:
JCodeModel cm = new JCodeModel();
JDefinedClass dc = cm._class("foo.Bar");
JMethod m = dc.method(0, int.class, "foo");
m.body()._return(JExpr.lit(5));
File file = new File("./target/classes");
file.mkdirs();
cm.build(file);
I can get this output:
package foo;
public class Bar {
in...
Reference: mod_rewrite, URL rewriting and “pretty links” explained
...P requests. An HTTP request at its most basic level looks like this:
GET /foo/bar.html HTTP/1.1
This is the simple request of a browser to a web server requesting the URL /foo/bar.html from it. It is important to stress that it does not request a file, it requests just some arbitrary URL. The req...
Using the slash character in Git branch name
... Thanks for the in depth reply.. Interstingly I tried git branch foo/bar (which worked); then git branch -d foo/bar, but I see that the foo/ directory (now empty) still exists! EDIT: and it is replaced as soon as I do "git branch foo". All is well.
– user58777
...
How to properly check if std::function is empty in C++11?
...td::function, std::plus
int main () {
std::function<int(int,int)> foo,bar;
foo = std::plus<int>();
foo.swap(bar);
std::cout << "foo is " << (foo ? "callable" : "not callable") << ".\n";
std::cout << "bar is " << (bar ? "callable" : "not callable...
What are “named tuples” in Python?
...mport NamedTuple
class ANamedTuple(NamedTuple):
"""a docstring"""
foo: int
bar: str
baz: list
The above is the same as the below, except the above additionally has type annotations and a docstring. The below is available in Python 2+:
>>> from collections import namedtup...
Remove element of a regular array
I have an array of Foo objects. How do I remove the second element of the array?
15 Answers
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