pyret

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

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Pyret is a programming language designed to serve as an outstanding choice for programming education while exploring the confluence of scripting and functional programming. It's under active design and development, and free to use or modify.

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

pyret - Programming language

Language features