create a raw json to nested json object - javascript

my array that i download from the server looks like this,

array=[ { icon: 'm-waing',
    color: '#FDC204',
    name: 'exp1',
    team: 'c',
    user: 'alpha' },
  { icon: 'm-puzzle',
    color: '#86AF45',
    name: 'exp2',
    team: 'c',
    user: 'alpha' },
  { icon: 'm-refresh',
    color: '#77A746',
    name: 'exp3',
    team: 'c',
    user: 'alpha' },
  { icon: 'm-puzzle',
    color: '#86AF45',
    name: 'exp3',
    team: 'a',
    user: 'beta' },
  { icon: 'm-clock',
    color: '#4677A7',
    name: 'exp4',
    team: 'b',
    user: 'beta' },
  { icon: 'm-waing',
    color: '#FDC204',
    name: 'exp5',
    team: 'a',
    user: 'gamma' } ]

If i need to create a nested object( # of exps, belonging to respective teams, organized by user) from the above array how would i go about it. my resulting nested object shud look like this, (notice alpha has 3 exps belonging to team c) and so on and so forth

[{
    id: 'gamma',
                data: [
                                    [
                                        'a',
                                        1
                                    ]
                                ]
                            },
{
    id: 'beta',
                data: [
                                    [
                                        'a',
                                        1
                                    ],
                                     [
                                        'b',
                                        1
                                    ]
                                ]
                            },
                            {
    id: 'alpha',
                data: [
                                    [
                                        'c',
                                        3
                                    ]
                                ]
                            }]

you can do this traditionally with couple of for loops. but is there a easier way to reduce the for loop cycles and get this created. the caveat is, this must be strict JS I do not know how many users/teams/exps there might be. there may be 50 different users/1000 different experiments . So i can't hardcode any exp names/users/ etc.