Semicolons after function declarations are not necessary. The grammar of a FunctionDeclaration is described in the specification as this: function Identifier ( FormalParameterListopt ) { FunctionBody } There’s no semicolon grammatically required, but might wonder why? Semicolons serve to separate statements from each other, and a FunctionDeclaration is not a statement. FunctionDeclarations are evaluated before … Read more
It’s a strictness declaration. Basically, it means that it must be evaluated to what’s called “weak head normal form” when the data structure value is created. Let’s look at an example, so that we can see just what this means: data Foo = Foo Int Int !Int !(Maybe Int) f = Foo (2+2) (3+3) (4+4) … Read more
You’re right, see 3.1.3. Unicode Strings. It’s been the syntax since Python 2.0. Python 3 made them redundant, as the default string type is Unicode. Versions 3.0 through 3.2 removed them, but they were re-added in 3.3+ for compatibility with Python 2 to aide the 2 to 3 transition.
If you’re looking for a way of applying the “static” keyword to a class, like you can in C# for example, then you won’t be able to without using Managed C++. But the looks of your sample, you just need to create a public static method on your BitParser object. Like so: BitParser.h class BitParser … Read more
If the type implements IDisposable, it automatically disposes that type. Given: public class SomeDisposableType : IDisposable { …implmentation details… } These are equivalent: SomeDisposableType t = new SomeDisposableType(); try { OperateOnType(t); } finally { if (t != null) { ((IDisposable)t).Dispose(); } } using (SomeDisposableType u = new SomeDisposableType()) { OperateOnType(u); } The second is easier … Read more
bash -n scriptname Perhaps an obvious caveat: this validates syntax but won’t check if your bash script tries to execute a command that isn’t in your path, like ech hello instead of echo hello.
It is a self-executing anonymous function. The first set of parentheses contain the expressions to be executed, and the second set of parentheses executes those expressions. It is a useful construct when trying to hide variables from the parent namespace. All the code within the function is contained in the private scope of the function, … Read more
foo->bar is equivalent to (*foo).bar, i.e. it gets the member called bar from the struct that foo points to.
Yes, it is possible. try: … except FirstException: handle_first_one() except SecondException: handle_second_one() except (ThirdException, FourthException, FifthException) as e: handle_either_of_3rd_4th_or_5th() except Exception: handle_all_other_exceptions() See: http://docs.python.org/tutorial/errors.html The “as” keyword is used to assign the error to a variable so that the error can be investigated more thoroughly later on in the code. Also note that the parentheses … Read more
You can use this equivalent syntax: obj[name] = value Example: let obj = {}; obj[“the_key”] = “the_value”; or with ES6 features: let key = “the_key”; let obj = { [key]: “the_value”, }; in both examples, console.log(obj) will return: { the_key: ‘the_value’ }