Group by a set of JavaScript Objects

I’ve got this set of data :

  { CIRPIC: 'AUA', ALLPIC: 2 },
  { CIRPIC: 'AUA', ALLPIC: 3 },
  { CIRPIC: 'AUA', ALLPIC: 1 },
  { CIRPIC: 'AUA', ALLPIC: 4 },
  { CIRPIC: 'AUF', ALLPIC: 12 },
  { CIRPIC: 'AU3', ALLPIC: 2 },
  { CIRPIC: 'AU3', ALLPIC: 7 },

And I would like it to be like this :

{CIRPIC: 'AUA', ALLPIC: [2,3,1,4]},
{CIRPIC: 'AUF', ALLPIC: [12]},
{CIRPIC: 'AU3', ALLPIC: [2,7]},

Thanks for your help

>Solution :

var groupBy = allees.reduce(function (obj, item) {
    obj[item.CIRPIC] = obj[item.CIRPIC] || [];
    obj[item.CIRPIC].push(item.ALLPIC);
    return obj;
}, {});

const newArray = Object.keys(groupBy).map(function (key) {
    return {CIRPIC: key, ALLPIC: groupBy[key]};
});