...r **kwargs as the last items in your function definition’s argument list allows that function to accept an arbitrary number of arguments and/or keyword arguments. For example, if you wanted to write a function that returned the sum of all its arguments, no matter how many you supply, you could wr...

...to a hash (most common case), to an array (not so common), to a scalar (usually this indicates an inside-out object), to a regular expression, subroutine or TYPEGLOB (see the book Object Oriented Perl: A Comprehensive Guide to Concepts and Programming Techniques by Damian Conway for useful examples)...

... Both sortWith and sortBy have a compact syntax: case class Foo(time:Long, str:String) val l = List(Foo(1, "hi"), Foo(2, "a"), Foo(3, "X")) l.sortWith(_.time > _.time) // List(Foo(3,X), Foo(2,a), Foo(1,hi)) l.sortBy(- _.time) // List(Foo(3,X), Foo(2,a), Foo(1,hi)) l....

It seems that in Sinatra all route handlers are being written into a single file, if I understand right it acts as a one large/small controller. Is there any way to split it into separate independent files, so when let's say somebody calls "/" - one action is executed, and if smth like "/posts/2" is...

...ay have chosen an Interface or parent type if you were to set the type manually. Update 8 Years Later I need to update this as my understanding has changed. I now believe it may be possible for var to affect performance in the situation where a method returns an interface, but you would have used a...

...f; When reading this line, the compiler will create a new class (let's call it FooInt), which is equivalent to the following: struct FooInt { int bar; void doSomething(int param) {/* do stuff using int */} } Consequently, the compiler needs to have access to the implementation of the m...

... Sun provides an API called CodeModel for generating Java source files using an API. It's not the easiest thing to get information on, but it's there and it works extremely well. The easiest way to get hold of it is as part of the JAXB 2 RI - th...

...- Watcher subclasses type, not object. 2 - SuperClass has no superclass at all, not object. I'm just so used to writing down object as a superclass for every class I defined that I somehow missed it that this code was using something else. Although there doesn't seem to be any harm in making SuperCl...

..." # false :foo.equal? :foo # true This makes comparing two symbols really fast (since only a pointer comparison is involved, as opposed to comparing all the characters like you would in a string), plus you won't have a zillion copies of the same symbol floating about. Also, unlike strings, sy...

...her object scream = shout # Notice we don't use parentheses: we are not calling the function, # we are putting the function "shout" into the variable "scream". # It means you can then call "shout" from "scream": print(scream()) # outputs : 'Yes!' # More than that, it means you can remove the old...