Nu (programming language)

Nu
Paradigm	structured, imperative, functional, object-oriented
Designed by	Tim Burks
Developer	Tim Burks
First appeared	2007; 17 years ago
Stable release	2.3.0 / July 29, 2019; 5 years ago
Typing discipline	dynamic
Platform	x86
OS	OS X
License	Apache, v. 2.0
Website	programming-nu.github.io
Influenced by
	Lisp, Objective-C, Ruby

Nu is an interpreted object-oriented programming language, with a Lisp-like syntax, created by Tim Burks as an alternative scripting language to program OS X through its Cocoa application programming interface (API). Implementations also exist for iPhone and Linux.

The language was first announced at C4,^[1] a conference for indie Mac developers held in August 2007.

Example code

This Nu code defines a simple complex numbers class.

(class Complex is NSObject
  (ivar (double) real
        (double) imaginary)

  (- initWithReal:(double) x imaginary:(double) y is
    (super init)
    (set @real x)
    (set @imaginary y)
    self))

The example is a basic definition of a complex number: it defines the instance variables, and a method to initialize the object. It shows the similarity between the code in Nu and the equivalent in Objective-C; it also shows the similarity with Ruby.

(unless @prefix
        (set @prefix 
             "#{((((NSProcessInfo processInfo) arguments) 0) dirName)}.."))

(unless @icon_files 
        (set @icon_files 
             (array "#{@prefix}/share/nu/resources/nu.icns")))