loop_array.js

var Caml_array = require("./stdlib/caml_array.js");

function sum(arr) {
  var v = 0;
  for(var i = 0 ,i_finish = arr.length - 1 | 0; i <= i_finish; ++i){
    v = v + Caml_array.caml_array_get(arr, i) | 0;
  }
  return v;
}

console.log(sum(/* array */[
          10,
          20,
          30
        ]));