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module Main (main) where-- not needed in interpreter, is the default in a module file main:: IO ()-- the compiler can infer this type definition main = putStrLn "Hello, World!" The factorial function in Haskell, defined in a few different ways (the first line is the type annotation , which is optional and is the same for each implementation):
Transformation languages serve the purpose of transforming (translating) source code specified in a certain formal language into a defined destination format code. It is most commonly used in intermediate components of more complex super-systems in order to adopt internal results for input into a succeeding processing routine.
This allows using imperative code where it may be impractical to write functional code, while still keeping all the safety that pure code provides. Here is an example program (taken from the Haskell wiki page on the ST monad ) that takes a list of numbers, and sums them, using a mutable variable:
Parsec is a library for writing parsers written in the programming language Haskell. [3] It is based on higher-order parser combinators, so a complicated parser can be made out of many smaller ones. [4]
Technically, Perl does not have a convention for including block comments in source code, but POD is routinely used as a workaround. PHP. PHP supports standard C/C++ style comments, but supports Perl style as well. Python. The use of the triple-quotes to comment-out lines of source, does not actually form a comment. [19]
The hash function in Java, used by HashMap and HashSet, is provided by the Object.hashCode() method. Since every class in Java inherits from Object , every object has a hash function. A class can override the default implementation of hashCode() to provide a custom hash function more in accordance with the properties of the object.
The Haskell Platform is a set of software packages, tools, and libraries that create a common platform for using and developing applications in the programming language Haskell. With the Haskell Platform, Haskell follows the same principle as Python : "Batteries included". [ 3 ]
Atom is a concurrent programming language intended for embedded applications. Atom features compile time task scheduling and generates code with deterministic execution time and memory use, simplifying worst case execution time analysis for applications that need hard realtime performance.