// ES6 version of example

​

const characters = [

  {name: 'Luke Skywalker', img: 'http://example.com/img/luke.jpg', species: 'human'},

  {name: 'Han Solo', img: 'http://example.com/img/han.jpg', species: 'human'},

  {name: 'Leia Organa', img: 'http://example.com/img/leia.jpg', species: 'human'},

  {name: 'Chewbacca', img: 'http://example.com/img/chewie.jpg', species: 'wookie'}

];

​

const humans = data => data.filter(character => character.species === 'human');

​

const images = data => data.map(character => character.img);

​

const compose = (func1, func2) => data => func2(func1(data));

​

const displayCharacterImages = compose(humans, images); 

​

console.log(displayCharacterImages(characters)); // ["http://example.com/img/luke.jpg", "http://example.com/img/han.jpg", "http://example.com/img/leia.jpg"]