``
    var profiles= [
    {
    id: ‘id123’,
    name: “lin”,
    age: 23
    },
    {
    id: ‘id456’,
    name: “lin2”,
    age: 12
    },
    {
    id: ‘id678’,
    name: “lin3”,
    age: 13
    }
    ];

    var currentProfile = {
    id: ‘id456’,
    name: “lin2”,
    age: 12
    };

    var currentProfileIndex = (profiles|| []).findIndex((profile) => profile.id === currentProfile .id);

    console.log(currentProfileIndex );