class MyClass {
  constructor(myArg) {
    this.myProperty = myArg;
  }
  init() {
    console.log(this.myProperty);
  }
}

for (var i = 0; i < 5; i++){
	//TODO
}
console.log(i); //5

for (let i = 0; i < 5; i++){
	//TODO
}
console.log(i); // ReferenceError: i is not defined

function a() {
  var x = 1;
  function b() {
    var x = 2;
  }
}

zip = lottery.drawWinner?().address?.zipcode

Object.prototype.$=function(slot){
 var self = this
 if(slot in this && typeof this[slot] === "function") return function(){return self[slot].apply(self, arguments)}
 if(slot in this) return this[slot]
 return {value: undefined}
}

o={foo: {bar: 1}, bar: 1, baz: function(x){return x+this.bar}}

console.log(
 o.$("foo").$("bar"),
 o.$("baz")(4),
 o.$("moo").$("foo")
)

//1 5 { value: undefined }