It's literally how it works for arrow-less functions, though - "this" is bound to the receiver at call site:

   foo = function() { console.log(this.n); };
   o1 = { foo, n: 1 };
   o2 = { foo, n: 2 };
   o1.foo();  // 1
   o2.foo();  // 2

I can't think of any other language that does it this way. Arrow-functions, OTOH, behave as lambdas normally do:

   foo = () => { console.log(this.n); };
   o1 = { foo, n: 1 };
   o2 = { foo, n: 2 };
   o1.foo(); // undefined
   o2.foo(); // undefined