javascript map 2nd example

map2.js

const lowerCaseSongs = songs.map(mySongFunc);

var mySongFunc = function(song) {
  return song.name.toLowerCase();
};

// ES6
const mySongFunc = song => {
  return song.name.toLowerCase();
};

console.log(lowerCaseSongs); // ["curl of the burl","oblivion","flying whales","l'enfant sauvage"];