Group by element in array by keyword

Question

I am developing an application on AngularJS (1) and I can not figure out how to split array of items in another array group by item.

I mean I have an array of different

Answer 1

You can use reduce and Object.values()

let a = [
    {"name": "toto", "uuid": 1111},
    {"name": "tata", "uuid": 2222},
    {"name": "titi", "uuid": 1111}
];

let b = Object.values(a.reduce((a,b) => {
    a[b.uuid] = a[b.uuid] ? a[b.uuid].concat(b) : [b];
    return a;
}, {}));

console.log(b);