Iteration

for...of

const myArray = ['a', 'b', 'c', 'd', 'e', 'f', 'g'];

for (const element of myArray) {
  console.log(element);
}

for...in

for (const <KEY> in <OBJECT>) {
  // Code in the statement body
}

const address = {
  street1: '11 Broadway',
  street2: '2nd Floor',
  city: 'New York',
  state: 'NY',
  zipCode: 10004
};

for (const key in address) {
  console.log(key);
}

// LOG: street1
// LOG: street2
// LOG: city
// LOG: state
// LOG: zipCode

const address = {
  street1: '11 Broadway',
  street2: '2nd Floor',
  city: 'New York',
  state: 'NY',
  zipCode: 10004
};

for (const key in address) {
	console.log(address[key]);
}

// LOG: 11 Broadway
// LOG: 2nd Floor
// LOG: New York
// LOG: NY
// LOG: 10004