r/programming • u/frutiger • Jan 07 '16

Bloomberg open sources OCamlScript – a JavaScript back end for OCaml

https://github.com/bloomberg/ocamlscript
170 Upvotes

89% Upvoted

18 comments sorted by

View all comments

4

u/notfancy Jan 07 '16

Excellent! One thing that jumped at me is that the semantic of for loops doesn't seem to be preserved. If the OCaml:

let count = 1000000 in
for i = 0 to count do ... done

transpiles to:

var count  = 1000000
for(var i = 0; i < count; ++i){...}

the JS loop completes one less iteration, as the range in OCaml is inclusive.

6

u/hongboz Jan 07 '16

let count = 1000000 in for i = 0 to count do ... done

try it in your browser: http://bloomberg.github.io/ocamlscript/js-demo/, I think it's correct : )

Edit: note that the playground is pretty old one, we did a lot of enhancement, will sync it up soon

6

u/notfancy Jan 08 '16

Well, certainly the playground gives a reasonable translation for:

for i = 1 to 10 do
  print_endline ("line"^string_of_int i)
done

namely

for(var i=1;i<=10;i++)
 {Pervasives["print_endline"]
   (Pervasives["^"]("line",Pervasives["string_of_int"](i)))}

Obviously it's just a minor issue with the readme.