javascript group by sum array reduce

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Mylan
28 Feb 2017
1var array = [
2  { Id: "001", qty: 1 }, 
3  { Id: "002", qty: 2 }, 
4  { Id: "001", qty: 2 }, 
5  { Id: "003", qty: 4 }
6];
7
8var result = [];
9array.reduce(function(res, value) {
10  if (!res[value.Id]) {
11    res[value.Id] = { Id: value.Id, qty: 0 };
12    result.push(res[value.Id])
13  }
14  res[value.Id].qty += value.qty;
15  return res;
16}, {});
17
18console.log(result)
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