test SportHeroesGroup

correction_gist.js

function fixGpsTrack(gpsTrack) {
    // Make sure trackpoints are chronologically sorted by date
    // il n'y a pas besoin de réaffecter gpsTrack.
    gpsTrack.sort(function (trackpointA, trackpointB) {
        return trackpointB.timestamp - trackpointA.timestamp;
    });

    // Remove incomplete trackpoints
    gpsTrack.filter(function (trackpoint) {
        return trackpoint.lat && trackpoint.lon && trackpoint.timestamp;
    });
}

// Fetch the elevation of every trackpoint in the GPS track from a remote API
function getElevationFromGps(gpsTrack) {
    gpsTrack.forEach(function (trackpoint) {
        elevationAPI.getElevation(trackpoint.lat, trackpoint.lon, function (elevation) {
            trackpoint.ele = elevation;
        });
    });
}

// Calculate the total positive elevation (climb) of the GPS track
function getClimbFromElevation(gpsTrack) {
    const totalClimb = 0;

    // on itère sur le tableau en entrée, donc on part du premier élément [0] jusqu'au dernier.
    for (var i = 0, len = gpsTrack.length; i < len; i++) {
        if (gpsTrack[i].ele > gpsTrack[i - 1].ele) {
            // si l'altitude de [i] est supérieure, on calcule sa différence avec le précédent, pas le suivant.
            totalClimb += gpsTrack[i].ele - gpsTrack[i - 1].ele;
        }
    }

    return totalClimb;
}

// Returns a promise that will resolve into a object with gpsTrack & totalElevation once processed
function processGpsTrack(gpsTrack) {
    fixGpsTrack(gpsTrack);

    return new Promise((resolve, reject) => {
        return getElevationFromGps(gpsTrack);
    }).then((gpsTrack) => {
        let totalClimb = getClimbFromElevation(gpsTrack);
        return { gpsTrack, totalClimb };
    });
}