javascript es6 filter sum distinct

1const arr = [ { 'name': 'P1', 'value': 150 }, { 'name': 'P1', 'value': 150 }, { 'name': 'P2', 'value': 200 }, { 'name': 'P3', 'value': 450 } ];
2
3const res = Array.from(arr.reduce(
4  (m, {name, value}) => m.set(name, (m.get(name) || 0) + value), new Map
5), ([name, value]) => ({name, value}));
6console.log(res);