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How can I get the start time of the next appointment of a professional

I have a list of appointments with a start time, an end time and the practitioner’s id.

const appointments = [
{
    date: '2022-06-01',
    start_time: '15:40:00',
    end_time: '16:10:00',
    id_professional: 2
},
{
    date: '2022-06-01',
    start_time: '16:30:00',
    end_time: '16:50:00',
    id_professional: 2
},
{
    date: '2022-06-01',
    start_time: '16:30:00',
    end_time: '16:50:00',
    id_professional: 3
},
];

I have filtered the appointments that belong to that professional, but now what I want to do is to be able to get the end time of the first appointment and the start time of the next appointment for further processing.

let timeAux = startTimeInSeconds;
professionalIds.forEach(professionalId => {
    const appointmentsAux = appointments.filter(appointment => {
        return appointment.id_professional === professionalId;
    });
    appointmentsAux.forEach(appointmentAux => {
        const startTimeAux = appointmentAux.start_time;
        const [startTimeAuxHours, startTimeAuxMinutes] = startTimeAux.split(':');
        const startTimeAuxInSeconds = (parseInt(startTimeAuxHours) * 60 * 60 + parseInt(startTimeAuxMinutes) * 60);

        const endTimeAux = appointmentAux.end_time;
        const [endTimeAuxHours, endTimeAuxMinutes] = endTimeAux.split(':');
        const endTimeAuxInSeconds = (parseInt(endTimeAuxHours) * 60 * 60 + parseInt(endTimeAuxMinutes) * 60);

        if(endTimeAuxInSeconds > startTimeInSeconds){ //appointmen.end_time

            // We need the following appointment to get its start_time and see if it fits the time.
            //how do we get the next appointment?
            if (endTimeAuxInSeconds - startTimeAuxInSeconds >  startTimeInSeconds){
                //insert cita
            }
        }
    });
});

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Answer

forEach() has an index parameter you can use

appointmentsAux.forEach((appointmentAux, index) => {
  const nextAppointment = appointmentsAux[index + 1];
  if (nextAppointment) {
    // do something with the next appointment's info
    const nextStart = nextAppointment.start_time;
  }
...
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