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Update Exercise 13 answer to ES6 format #120

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Update Exercise 13 answer to ES6 format #120

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25 changes: 14 additions & 11 deletions index.html
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Expand Up @@ -1759,17 +1759,20 @@ <h4>Exercise 14: Use concatMap() to retrieve id, title, and 150x200 box art url
// {"id": 70111470,"title": "Die Hard","boxart":"http://cdn-0.nflximg.com/images/2891/DieHard150.jpg" }
// ];

return movieLists.concatMap(function(movieList) {
return movieList.videos.concatMap(function(video) {
return video.boxarts.
filter(function(boxart) {
return boxart.width === 150;
}).
map(function(boxart) {
return {id: video.id, title: video.title, boxart: boxart.url};
});
});
});
return movieLists.concatMap(movieList =>
movieList.videos.concatMap(video =>
video.boxarts.
filter(boxart => boxart.width === 150).
map(boxart =>
({
'id': video.id,
'title': video.title,
'boxart': boxart.url
})
)
)
);

}
</pre>
<p class="post">It's a very common pattern to see several nested concatMap operations, with the last operation being a
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