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// Input array
var input = [
    { id: 1, name: 'Tom', status: 'Accepted', category: 'Admin' },
    { id: 2, name: 'Chris', status: 'Not accepted', category: 'Moderator' },
    { id: 3, name: 'July', status: 'Accepted', category: 'Moderator' },
    { id: 4, name: 'John', status: 'To verify', category: 'Admin' },
    { id: 5, name: 'Jeff', status: 'Accepted', category: 'Admin' },
    { id: 6, name: 'Andrew', status: 'Accepted', category: 'Admin' },
];

// Output array grouped by category
[
    { name: 'Admin', children: [
            { id: 1, name: 'Tom', status: 'Accepted', category: 'Admin' },
            { id: 1, name: 'John', status: 'To verify', category: 'Admin' },
            { id: 5, name: 'Jeff', status: 'Accepted', category: 'Admin' },
            { id: 6, name: 'Andrew', status: 'Accepted', category: 'Admin' }
        ]        
    },
    { name: 'Moderator', children: [
            { id: 2, name: 'Chris', status: 'Not accepted', category: 'Moderator' },
            { id: 3, name: 'July', status: 'Accepted', category: 'Moderator' },
        ] 
    }
]