As I understand it, NaN is a sentinel instance of the Number class that represents, well, exactly what it stands for – numeric results that cannot be adequately represented. So 0/0 is not a number, in the sense that it’s NaN, but it is a Number in terms of its type. Perhaps it should have … Read more
This will work: function test() { var z = arguments.callee.name; console.log(z); }
Use the typeof operator: if (typeof model[property] == ‘function’) … Also, note that you should be sure that the properties you are iterating are part of this object, and not inherited as a public property on the prototype of some other object up the inheritance chain: for (var property in model){ if (!model.hasOwnProperty(property)) continue; … … Read more
you can do this: IList<Person> persons = new List<Person>(); public IList<T> GetPersons<T>() where T : Person { return persons.OfType<T>().ToList(); } IList<Student> students = GetPersons<Student>(); IList<Teacher> teacher = GetPersons<Teacher>(); EDIT: added the where constraint.
Slight adaptation of a previously posted answer, but this blog post seems to achieve what you’re asking for; http://blog.functionalfun.net/2009/10/getting-methodinfo-of-generic-method.html Sample usage would be as follows; var methodInfo = SymbolExtensions.GetMethodInfo(() => Program.Main()); Original answer was to this question; https://stackoverflow.com/a/9132588/5827
There is no typeof operator in c++. While it is true that such a functionality has been offered by most compilers for quite some time, it has always been a compiler specific language extension. Therefore comparing the behaviour of the two in general doesn’t make sense, since the behaviour of typeof (if it even exists) … Read more
I’ve been using the following type of code to check if the type is nullable and to get the actual type: if (type.IsGenericType && type.GetGenericTypeDefinition() == typeof(Nullable<>)) { return Nullable.GetUnderlyingType(type); } If the type is e.g. Nullable this code returns the int part (underlying type). If you just need to convert object into specific type … Read more
Two reasons: nameof turns into a compile-time constant. typeof(…).Name requires a bit of reflection. It’s not overly expensive, but it can hurt in some cases. Second, it’s used for other things than type names. For example, arguments: void SomeMethod(int myArgument) { Debug.WriteLine(nameof(myArgument)); } You can also get the name of class members and even locals. … Read more
There’s very little practical use for String objects as created by new String(“foo”). The only advantage a String object has over a primitive string value is that as an object it can store properties: var str = “foo”; str.prop = “bar”; alert(str.prop); // undefined var str = new String(“foo”); str.prop = “bar”; alert(str.prop); // “bar” … Read more
Because 0 is one of the many falsy values in javascript All these conditions will be sent to else blocks: if (false) if (null) if (undefined) if (0) if (NaN) if (”) if (“”) if (“) From the Array.prototype.filter() documentation: filter() calls a provided callback function once for each element in an array, and constructs … Read more