Inner modules in javascript

inner-module.js

// Using let and a block statement allows you to create Ocaml-like inner modules
let Foo
{
  // This is in a closure, but the module itself is declarative -- it's not a class
  let norf = 567

  // You can nest inner modules too
  let Bar
  {
    let exclaim = '!'
    Bar = name => ({ greet: `${name}${exclaim}` })
  }

  // But functors are most easily expressed as just regular functions with closure
  const Bar2 = name => {
    let exclaim = '!'
    let greet = `${name}${exclaim}`
    return { greet }
  }

  let bar = baz => baz + 123
  let qux = 456 + norf
  Foo = { bar, qux, r: Bar('risto'), r2: Bar2('risto') }
}

console.log(Foo)