Aldor is a programming language. It is the successor of A# as the extension language of the Axiom computer algebra system.

Aldor combines imperative, functional, and object-oriented features. It has an elaborate type system, 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:

<syntaxhighlight lang="cpp">

  1. include "aldor"
  2. include "aldorio"

stdout << "Hello, world!" << newline;

</syntaxhighlight>

Example of dependent types (from the User Guide):

<syntaxhighlight lang="haskell">

  1. include "aldor"
  2. include "aldorio"
  3. pile

sumlist(R: ArithmeticType, l: List R): R ==

s: R := 0;

for x in l repeat s := s + x

s

import from List Integer, Integer, List SingleFloat, SingleFloat

stdout << sumlist(Integer, [2,3,4,5]) << newline

stdout << sumlist(SingleFloat, [2.0, 2.1, 2.2, 2.4]) << newline

</syntaxhighlight>

99 Bottles of Beer:

<syntaxhighlight lang="haskell">

  1. include "aldor"
  2. 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();

</syntaxhighlight>

References

  • Open Source Development - Git repository
  • Aldor User Guide