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underscore.html
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<html>
<head>
<script src="https://code.jquery.com/jquery-2.1.1.js"></script>
<script type="text/javascript" src="https://cdn.rawgit.com/jashkenas/underscore/1.8.3/underscore-min.js"></script>
</head>
<body>
<div id="container"></div>
<script>
var products = [
{
name: "Go Set a Watchman",
category: "books",
selling_points: ["Controversial", "Publicity Bonanza", "Released by rapacious publishers against the wishes of senile author"],
price: 25,
picture_url: "https://upload.wikimedia.org/wikipedia/en/4/4e/US_cover_of_Go_Set_a_Watchman.jpg"
},
{
name: "Twilight",
category: "books",
selling_points: ["Doesn't make you think to hard", "Reinforces traditional gender-roles", "Doesn't make you think to hard"],
price: 9.99,
picture_url: "http://image.slidesharecdn.com/book-1-twilight-1231022548425199-1/95/book-1-twilight-1-728.jpg"
},
{
name: "How to Win Friends & Influence People",
category: "books",
selling_points: ["Timeless practical advice", "Actually useful and relevant to your life"],
price: 8,
picture_url: "http://htmlgiant.com/wp-content/uploads/2013/11/HowtoWinFriendsandInfluencePeopleCover.jpg"
},
{
name: "Dark Side of the Moon",
category: "music",
selling_points: ["Collector's Edition", "Trippy", "Good for late night existential crises"],
price: 100,
picture_url: "http://i.kinja-img.com/gawker-media/image/upload/s--9N1Ijk1t--/c_fit,fl_progressive,q_80,w_636/1940ob66cyu2ljpg.jpg"
},
{
name: "Thriller",
category: "music",
selling_points: ["Classic MJ", "The 80's greatest contribution to human progress"],
price: 19,
picture_url: "http://cps-static.rovicorp.com/3/JPG_400/MI0000/677/MI0000677650.jpg"
},
{
name: "Ella & Luis",
category: "music",
selling_points: ["How could you not?", "Seriously, though..."],
price: 110,
picture_url: "http://ecx.images-amazon.com/images/I/51713fx1VdL._SY300_.jpg"
}
]
_.uniq(products, function(x){return x.selling_points});
_.map(products, function(x){ return x.picture_url}
</script>
</body>
</html>