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hof5.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<script>
var products = [
{ "id": 1, "name": "iPhone", "price": 124447.44, "category": "mobile" },
{ "id": 2, "name": "Onida", "price": 4444.44, "category": "tv" },
{ "id": 3, "name": "OnePlus 6", "price": 98444.44, "category": "mobile" },
{ "id": 4, "name": "HDMI connector", "price": 2444.00, "category": "computer" },
{ "id": 5, "name": "Samsung", "price": 68000.00, "category": "tv" }
];
// complete this to implement GroupBy
var grouped = products.reduce(function (p1, p2) {
// {"mobile": [...], "computer", [...], "tv": [...] }
// if already group is present push element into group
p1[p2.category] = p1[p2.category] || [];
p1[p2.category].push(p2);
return p1;
}, {});
</script>
</body>
</html>