Why are arrays covariant but generics are invariant?
From Effective Java by Joshua Bloch, Arrays differ from generic type in two important ways. First arrays are covariant. Generics are invariant. Covariant … Read more
language-design
Why is an array not assignable to Iterable?
with Java5 we can write: Foo[] foos = … for (Foo foo : foos) or just using an Iterable in the for loop. … Read more
Why can’t I have abstract static methods in C#?
I’ve been working with providers a fair bit lately, and I came across an interesting situation where I wanted to have an abstract … Read more
How does “this” keyword work within a function?
I just came across an interesting situation in JavaScript. I have a class with a method that defines several objects using object-literal notation. … Read more
What blocks Ruby, Python to get Javascript V8 speed? [closed]
Closed. This question needs to be more focused. It is not currently accepting answers. Closed 7 years ago. Locked. This question and its … Read more
Function overloading by return type?
Why don’t more mainstream statically typed languages support function/method overloading by return type? I can’t think of any that do. It seems no … Read more
Benefits of prototypal inheritance over classical?
So I finally stopped dragging my feet all these years and decided to learn JavaScript “properly”. One of the most head-scratching elements of … Read more
What does DIM stand for in Visual Basic and BASIC?
What does Dim stand for in Visual Basic? 10 Answers 10
Why doesn’t Python have a sign function?
I can’t understand why Python doesn’t have a sign function. It has an abs builtin (which I consider sign‘s sister), but no sign. … Read more
Why must we define both == and != in C#?
The C# compiler requires that whenever a custom type defines operator ==, it must also define != (see here). Why? I’m curious to … Read more