I'm a javascript noobie, I started to use the library lodash and I'm having some problems. Can someone help me? :/

Input:

```
var a = [{group: 'A', title: 'test1', value: 'test2'},
         {group: 'A', title: 'test2', value: 'test3'},
         {group: 'B', title: 'test3', value: 'test4'},
         {group: 'B', title: 'test1', value: 'test2'},]

```

Output:

```
var a = {A: [
         { title: 'test1', value: 'test2'},
         { title: 'test2', value: 'test3'}
        ],
         B: [
         { title: 'test1', value: 'test2'},
         { title: 'test2', value: 'test3'}
        ],}

```