Aldor is a programming language.[1][2][3] It is the successor of A# as the extension language of the Axiom computer algebra system.
| Paradigm | Multi-paradigm: object-oriented, functional, imperative, dependent typed, logic |
|---|---|
| Designed by | Richard Dimick Jenks, Barry Trager, Stephen Watt, James Davenport, Robert Sutor, Scott Morrison |
| Developer | Thomas J. Watson Research Center |
| First appeared | 1990 |
| Stable release | 1.0.3 |
| Preview release | 1.1.0 |
| Platform | Axiom computer algebra system |
| OS | Linux, Solaris, Windows |
| License | Aldor Public 2.0, Apache 2.0 |
| Filename extensions | .al, .as |
| Website | aldor |
| Major implementations | |
| Axiom computer algebra system | |
| Influenced by | |
| A#, Pascal, Haskell | |
Aldor combines imperative, functional, and object-oriented features. It has an elaborate type system,[4] allowing types to be used as first-class values. Aldor's syntax is heavily influenced by Pascal, but it is optionally indentation-sensitive, using whitespace characters and the off-side rule, like Python. In its current implementation, it is compiled, but an interactive listener is provided.
Aldor is distributed as free and open-source software, under the Apache License 2.0.
Examples
The Hello world program looks like this:
#include "aldor"#include "aldorio"stdout << "Hello, world!" << newline;Example of dependent types (from the User Guide):
#include "aldor"#include "aldorio"#pilesumlist(R: ArithmeticType, l: List R): R == s: R := 0; for x in l repeat s := s + x simport from List Integer, Integer, List SingleFloat, SingleFloatstdout << sumlist(Integer, [2,3,4,5]) << newlinestdout << sumlist(SingleFloat, [2.0, 2.1, 2.2, 2.4]) << newline#include "aldor"#include "aldorio"import from Integer, String;bob(n: Integer): String == { b: String := " bottle"; if n ~= 1 then b := b + "s"; b + " of beer";}main(): () == { n: Integer := 99; otw: String := " on the wall"; -- refrain while n > 0 repeat { stdout << n << bob(n) << otw << ", " << n << bob(n) << "." << newline; stdout << "Take one down and pass it around, "; n := n - 1; if n > 0 then stdout << n; else stdout << "no more"; stdout << bob(n) << otw << "." << newline; stdout << newline; } -- last verse stdout << "No more" << bob(n) << otw << ", no more" << bob(n) << "." << newline; stdout << "Go to the store and buy some more, "; n: Integer := 99; stdout << n << bob(n) << otw << "." << newline;}main();