different between for...in and for...of #js

forInForOf.js

let list = [6,8,10];
list.tag = "hello";

// values of the numeric properties of the object being iterated
for(i of list) { // 6 8 10
  console.log(i)
}

// keys on the object being iterated
for(i in list) { // 0 1 2 tag
  console.log(i)
}