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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...
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) ...
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 ...
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...
What are the recommendations for html tag?
...hors like <a href="#anchor">, query string anchors like <a href="?foo=bar"> and path fragment anchors like <a href=";foo=bar">, with the <base> tag you're basically declaring all relative links relative to it, including those kind of anchors. None of the relative links are re...
Convert object string to JSON
...turn '"'+$1+'"'})
}
Result
var invalidJSON = "{ hello: 'world',foo:1, bar : '2', foo1: 1, _bar : 2, $2: 3, 'xxx': 5, \"fuz\": 4, places: ['Africa', 'America', 'Asia', 'Australia'] }"
JSON.parse(invalidJSON)
//Result: Uncaught SyntaxError: Unexpected token h VM1058:2
JSON.parse(JSONize...
What is the scope of variables in JavaScript?
...nction expressions are scoped only to the expression itself:
(function foo() { console.log(foo) })()
console.log(typeof foo) // undefined, because `foo` is scoped to its own expression
In non-strict mode, implicitly defined properties on the global object are globally scoped. In strict mod...
How do you generate dynamic (parameterized) unit tests in python?
...ass TestSequence(unittest.TestCase):
@parameterized.expand([
["foo", "a", "a",],
["bar", "a", "b"],
["lee", "b", "b"],
])
def test_sequence(self, name, a, b):
self.assertEqual(a,b)
Which will generate the tests:
test_sequence_0_foo (__main__.TestSequenc...