Answers for "for (var i in list"

for elem in list javascript

var myList = ["first element", "second element", "third element"];

for (let elem in myList) {
	console.log(elem);
}

javascript object array iteration

let obj = {
  key1: "value1",
  key2: "value2",
  key3: "value3"
}

Object.keys(obj).forEach(key => {
  let value = obj[key];
  //use key and value here
});