Iterators

`.forEach()`

const artists = ['Picasso', 'Kahlo', 'Matisse', 'Utamaro'];
 
artists.forEach(artist => {
  console.log(artist + ' is one of my favorite artists.');
});
 
// Picasso is one of my favorite artists.
// Kahlo is one of my favorite artists.
// Matisse is one of my favorite artists.
// Utamaro is one of my favorite artists.

`.map()`

const numbers = [1, 2, 3, 4, 5];
 
const squareNumbers = numbers.map(number => {
  return number * number;
});
 
console.log(squareNumbers);
 
// [ 1, 4, 9, 16, 25 ]

`.filter()`

const things = ['desk', 'chair', 5, 'backpack', 3.14, 100];
 
const onlyNumbers = things.filter(thing => {
  return typeof thing === 'number';
});
 
console.log(onlyNumbers);
 
// [ 5, 3.14, 100 ]