Custom Array Sorts

/**********************************************
for...of loops with
custom iterators
**********************************************/ 

let myObj = {
    prop1: 123, 
    prop2: 'bob', 
    prop3: true
}
myObj[Symbol.iterator] = function(){
    let counter = -1;
    return {
        next: function(){
            counter++;
            switch(counter){
                case 0:
                  return  {value: myObj.prop3, 
                          done: false};
                case 1:
                  return  {value: myObj.prop1, 
                          done: false};
                case 2:
                  return  {value: myObj.prop2, 
                          done: false};
                default:
                  return  {value: undefined, 
                          done: true};
            }
            return {value: undefined, done: true};
        }
    }
}

let iter = myObj[Symbol.iterator]();
console.log(iter.next());
console.log(iter.next());
console.log(iter.next());
console.log(iter.next());

// The below code - when there is an iterator attached to the object - returns the values of the 3 properties in the object, myObj
//for(let prop of myObj) {
//    console.log(prop);
//}