pyret

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pyret is a programming language created in 2011 by Joe Gibbs Politz.

Source code:

git clone https://github.com/brownplt/pyret-lang

#407on PLDB

13Years Old

The Pyret language.

pyret website
pyret is developed on GitHub and has 924 stars
pyret first developed in Brown University
pyret.org was registered in 2011

Example from the web:

data BinTree:
 | leaf
 | node(value, left, right)
end
fun tree-sum(t):
  doc: "Calculate the sum of node values"
  cases (BinTree) t:
    | leaf => 0
    | node(v, l, r) =>
      v + tree-sum(l) + tree-sum(r)
  end
where:
  tree-sum(leaf) is 0
  node4 = node(4, leaf, leaf)
  tree-sum(node(5, node4, leaf)) is 9
end

Example from hello-world:

print('Hello World')

Feature	Supported	Token	Example
Strings	✓	'	'Hello world'
Print() Debugging	✓	print

Language features