Solution Review: The Calculator Object

/* Type definition */
type calculator = {. /* The . operator to indicate the closed object */
  add: (float, float) => float,
  subtract: (float, float) => float,
  multiply: (float, float) => float,
  divide: (float, float) => float
};
/* Object Creation */
let cal: calculator = {
  /* Public methods */
  pub add = (first, second) => first +. second;
  pub subtract = (first, second) => first -. second;
  pub multiply = (first, second) => first *. second;
  pub divide = (first, second) => first /. second;
};
Js.log(cal#add(10.5, 5.0));
Js.log(cal#subtract(10.5, 5.0));
Js.log(cal#multiply(10.5, 5.0));
Js.log(cal#divide(10.5, 5.0));