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Javascript: best Singleton pattern [duplicate]
... return instance;
}
this.instance = this;
}
foo() {
// ...
}
}
console.log(new Singleton() === new Singleton());
(2) ES6 Version
class Singleton {
constructor() {
const instance = this.constructor.instance;
if (instance) {
...
unit testing of private functions with mocha and node.js
...se the usage would be something like:
var rewire = require('rewire'),
foobar = rewire('./foobar'); // Bring your module in with rewire
describe("private_foobar1", function() {
// Use the special '__get__' accessor to get your private function.
var private_foobar1 = foobar.__get__('pri...
LINQ: Select an object and change some properties without creating a new object
...Q expression example.
var query = someList.Select(x => { x.SomeProp = "foo"; return x; })
What this does is use an anonymous method vs and expression. This allows you to use several statements in one lambda. So you can combine the two operations of setting the property and returning the obje...
Return only string message from Spring MVC 3 Controller
...equestMapping(value="/controller", method=GET)
@ResponseBody
public String foo() {
return "Response!";
}
From: 15.3.2.6 Mapping the response body with the @ResponseBody annotation:
The @ResponseBody annotation [...] can be put on a method and indicates that the return type should be writte...
Best way to parse command-line parameters? [closed]
...t.OptionParser[Config]("scopt") {
head("scopt", "3.x")
opt[Int]('f', "foo") action { (x, c) =>
c.copy(foo = x) } text("foo is an integer property")
opt[File]('o', "out") required() valueName("<file>") action { (x, c) =>
c.copy(out = x) } text("out is a required file prope...
How to make an enum conform to a protocol in Swift?
...lip between cases as follows:
enum SimpleEnum: ExampleProtocol {
case Foo, Bar
var simpleDescription: String {
get {
let value = self == .Foo
? "Foo"
: "Bar"
return "A simple \(value) enum."
}
}
mutating func adjust() {
self ...
Why does string::compare return an int?
...
if I was to design a compare method that compares two objects of type Foo and I only wanted to return -1, 0 or 1, would using short or char generally be a good idea?
It would be ok idea. A better way would be to return a bool (if only want to compare if equal), or enum (for more information) ...
Best way to check for “empty or null value”
...lesce(stringexpression, '') = ' ' AS coalesce3
FROM (
VALUES
('foo'::char(5))
, ('')
, (' ') -- not different from '' in char(n)
, (NULL)
) sub(stringexpression);
Result:
stringexpression | base_test | test1 | test2 | coalesce1 | coalesce2 | coalesce3
---...
JavaScript equivalent of PHP’s die
... from within a function in the scope. This means you can't do stuff like:
foo: { // this doesn't work
(function() {
break foo;
}());
}
You can do something similar though with functions:
function myFunction() {myFunction:{
// you can now use break myFunction; instead of return;
}}
...
File path to resource in our war/WEB-INF folder?
...ntext = getContext();
String fullPath = context.getRealPath("/WEB-INF/test/foo.txt");
http://tomcat.apache.org/tomcat-5.5-doc/servletapi/javax/servlet/ServletContext.html#getRealPath(java.lang.String)
That will get you the full system path to the resource you are looking for. However, that won't...