In addition to breaking === and typeof returning “object”, using the Number constructor also changes the way the value is used in boolean contexts. Since “new Number(0)” is an object, not a literal value, it evaluates as “true” because it is not null. So for example: var n1 = 0; var n2 = new Number(0); … Read more
From Joshua Bloch effective Java, Chapter 2. Creating and Destroying Objects, 1 Item: Consider static factory methods instead of constructors Why? One advantage of static factory methods is that, unlike constructors, they have names. With static factory methods we can specify some instantiation behavior in the method definition. This makes the API easier to use … Read more
For me, the correct answer is: You should pass in as many variables as is required to setup the object in a state that is not invalid. Anything else that is “option”, I prefer to leave as properties, especially now that C# provides object initializers.
You can always make a call to one constructor from within another. Say, for example: public class mySampleClass { public mySampleClass(): this(10) { // This is the no parameter constructor method. // First Constructor } public mySampleClass(int Age) { // This is the constructor with one parameter. // Second Constructor } } this refers to … Read more
Ruby doesn’t have constructors, therefore it’s obviously not possible to call them, parent or otherwise. Ruby does have methods, however, and in order to call the parent’s method with the same name as the currently executing method, you can use the super keyword. [Note: super without arguments is a shortcut for passing the same arguments … Read more
The first one is not legal in C#. The only two items that can appear after the colon in a constructor are base and this. So I’d go with the second one.
So, these are actually two different problems. The Desktop Chrome warning was a bug in chrome which is fixed since 2013-03-21. Mobile Chrome is giving you a TypeError because the blob constructor is not supported. Instead you must use the old BlobBuilder API. The BlobBuilder API has browser specific BlobBuilder constructors. This is the case … Read more
if the member or constructor is declared private, then access is permitted if and only if it occurs within the body of the top level class (ยง7.6) that encloses the declaration of the member or constructor. http://docs.oracle.com/javase/specs/jls/se7/html/jls-6.html#jls-6.6.1
Instance variable initialization expressions such as int var = getVal(); are evaluated after the super class constructor is executed but prior to the execution of the current class constructor’s body. Therefore getVal() is called before the body of the ChkCons constructor is executed.