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= Export OCaml code to JavaScript
The easiest way to export OCaml values (e.g., functions) to JavaScript is to
create a JavaScript object containing all values to export
and to make the object reachable.
<<code language="ocaml"|
open Js_of_ocaml
let _ =
Js.export "myMathLib"
(object%js
method add x y = x +. y
method abs x = abs_float x
val zero = 0.
end)
>>
<<code language="javascript"|
myMathLib.add(3,4)
>>
== Using the Node.js module system
{{{Js.export}}} and {{{Js.export_all}}} will export a value to {{{module.exports}}} if it exists.
{{{
# cat math.ml
open Js_of_ocaml
let _ =
Js.export_all
(object%js
method add x y = x +. y
method abs x = abs_float x
val zero = 0.
end)
# ocamlfind ocamlc -verbose \
-package js_of_ocaml -package js_of_ocaml-ppx \
-linkpkg math.ml -o math.byte
# js_of_ocaml math.byte
# node
# > var math = require("./math.js");
# > math.add(2,3)
}}}
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