JS++

JS++ is a BSD-licensed programming language for web development that extends JavaScript with a sound type system. It includes imperative, object-oriented, functional, and generic programming features.

JS++

Paradigm	Imperative, structured, object-oriented, functional, generic
Designed by	Roger Poon, Anton Rapetov
Developer	Onux
First appeared	October 8, 2011; 13 years ago (2011-10-08)
Typing discipline	Gradual, static, dynamic
License	BSD License
Filename extensions	.jspp, .js++, .jpp
Website	www.onux.com/jspp/
Influenced by
C, C++, C#, Java, JavaScript

History

JS++ first appeared on October 8, 2011.^[1][2][3] The modern implementation was announced at DeveloperWeek 2016^[4] and released on May 31, 2016.^[5][6][7][8] The language is designed by Roger Poon and Anton Rapetov.

Syntax

Type annotations

Since JS++ is a superset of JavaScript, declaring types for variables is optional.

int x = 1; // declares the variable x with an "internal type" (JS++ type)
var y = 2; // declares the variable y with an "external type" (JavaScript type)
bool z = true; // declares the variable z with an "internal type" (JS++ type)

Features

JS++ features a type system that is sound.^[9][10]

JS++ is able to efficiently analyze out-of-bounds errors at compile time.^[11][12][13]

Development tools

Compiler

The JS++ compiler is available for Windows, Mac OS X, and Linux. The compiler generates JavaScript output.

Editor integration

JS++ integrates with various code editors including Visual Studio Code, Atom, and Sublime Text.^[14][15][16]

Build tools

JS++ can be integrated with third-party build tools like Webpack.^[17]

Release history

Version number	Release date	Changes
0.01	8 October 2011 (2011-10-08)	Alpha version, initial release
0.011	10 October 2011 (2011-10-10)	Alpha version
0.012	25 October 2011 (2011-10-25)	Alpha version
0.013	29 January 2012 (2012-01-29)	Alpha version
0.014.1	15 August 2012 (2012-08-15)	Alpha version
0.4.1	31 May 2016 (2016-05-31)	Beta version, array and callback types, character literals, integral suffixes, removed ECMAScript ASI
0.4.2	18 October 2016 (2016-10-18)	Modules, function overloading, dead code elimination, editor integrations
0.4.2.1	24 October 2016 (2016-10-24)	Bug fixes
0.4.2.2	17 November 2016 (2016-11-17)	Source map debugging
0.4.2.4	25 December 2016 (2016-12-25)	Support for Mac OS X, C-style casts, callback and array conversions
0.5.0	13 March 2017 (2017-03-13)	Classes
0.5.1	26 March 2017 (2017-03-26)	'foreach' loops
0.5.2	27 July 2017 (2017-07-27)	BSD License, Interfaces, Abstract Classes, Virtual Methods, Auto-boxing
0.7.0	27 October 2017 (2017-10-27)	All ECMAScript 3 features via Array<T> and Standard Library
0.8.0	15 March 2018 (2018-03-15)	Generic programming, Dictionary<T>, multi-line strings, .js++ file extension
0.8.1	27 March 2018 (2018-03-27)	auto, catch-all clauses, standard library modules for handling time, bug fixes
0.8.4	23 May 2018 (2018-05-23)	New string functions, advanced generics, bug fixes, standard library expansion
0.8.5	2 June 2018 (2018-06-02)	Bug fixes
0.8.10	24 November 2018 (2018-11-24)	Faster compile times, stacks, queues, Unicode, Base64, generic default constraint rules
0.9.0	11 January 2019 (2019-01-11)	Efficient compile time out-of-bounds error analysis
0.9.1	1 July 2019 (2019-07-01)	Bug fixes
0.9.2	18 October 2019 (2019-10-18)	Final (immutable) variables and default to 64-bit for macOS Catalina

See also

• TypeScript
• PureScript