arrow.js

// So, ECMAScript 6 Harmony arrow_function_syntax says:
// ----8<----8<----8<----
// ''=>'' has only lexical ''this'', no dynamic ''this''
const obj = {
  method: function () {
    return () => this;
  }
};
assert(obj.method()() === obj);
 
let fake = {steal: obj.method()};
assert(fake.steal() === obj);
 
// But ''function'' still has dynamic ''this'' of course
let real = {borrow: obj.method};
assert(real.borrow()() === real);
// ----8<----8<----8<----
// So what about this:
cons obj = {
  method: function() {
    return () => function() {
      this;
    }
  }
}
assert(obj.method()()() == obj),

let fake = { steal: obj.method()};
assert(fake.steal()() === /*???*/ );
// Is 'this' from the innermost function inheriting the object dynamic scope,
// same as the outermost function? Or does the lexical 'this' from the middle
// arrow scope get dynamically inherited by the innermost function?