Using an iterator to get values from object or array in ES6

iterator.js

//Showing the difference between using a 'for' loop and 'for of' loop in ES6
let numbs = [1,2,3,4,5];

sum = 0;
for (let i = 0; 0 > numbs.length; i++){
    sum += numbs[i];
}
console.log(sum); //15

sum = 0; 

//the 'for of' loop in ES6 is actually using an iterator.
//numbs[Symbol.iterator]();
//also great for parsing over more complex data structures that are iterable.
for (let i of numbs){
    sum += i; //direct access to object in array
}

console.log(sum); //15